dnl Process this file with autoconf to produce a configure script.
AC_INIT(README.txt)
AC_CONFIG_HEADER(include/SDL_config.h)
AC_CONFIG_AUX_DIR(build-scripts)
AC_CONFIG_MACRO_DIR([acinclude])

dnl Save the CFLAGS to see whether they were passed in or generated
orig_CFLAGS="$CFLAGS"

dnl Set various version strings - taken gratefully from the GTk sources
#
# Making releases:
# Edit include/SDL_version.h and change the version, then:
#   SDL_MICRO_VERSION += 1;
#   SDL_INTERFACE_AGE += 1;
#   SDL_BINARY_AGE += 1;
# if any functions have been added, set SDL_INTERFACE_AGE to 0.
# if backwards compatibility has been broken,
# set SDL_BINARY_AGE and SDL_INTERFACE_AGE to 0.
#
SDL_MAJOR_VERSION=2
SDL_MINOR_VERSION=0
SDL_MICRO_VERSION=4
SDL_INTERFACE_AGE=0
SDL_BINARY_AGE=4
SDL_VERSION=$SDL_MAJOR_VERSION.$SDL_MINOR_VERSION.$SDL_MICRO_VERSION

AC_SUBST(SDL_MAJOR_VERSION)
AC_SUBST(SDL_MINOR_VERSION)
AC_SUBST(SDL_MICRO_VERSION)
AC_SUBST(SDL_INTERFACE_AGE)
AC_SUBST(SDL_BINARY_AGE)
AC_SUBST(SDL_VERSION)

# libtool versioning
LT_INIT([win32-dll])

LT_RELEASE=$SDL_MAJOR_VERSION.$SDL_MINOR_VERSION
LT_CURRENT=`expr $SDL_MICRO_VERSION - $SDL_INTERFACE_AGE`
LT_REVISION=$SDL_INTERFACE_AGE
LT_AGE=`expr $SDL_BINARY_AGE - $SDL_INTERFACE_AGE`
m4_pattern_allow([^LT_])

AC_SUBST(LT_RELEASE)
AC_SUBST(LT_CURRENT)
AC_SUBST(LT_REVISION)
AC_SUBST(LT_AGE)

dnl Detect the canonical build and host environments
dnl AC_CANONICAL_HOST

dnl Check for tools
AC_PROG_LIBTOOL
AC_PROG_CC
AC_PROG_CXX
AC_PROG_INSTALL
AC_PROG_MAKE_SET
AC_CHECK_TOOL(WINDRES, [windres], [:])

dnl Make sure that srcdir is a full pathname
case "$host" in
    *-*-mingw32*)
        # Except on msys, where make can't handle full pathnames (bug 1972)
        ;;
    *)
        srcdir=`cd $srcdir && pwd`
        ;;
esac

dnl Set up the compiler and linker flags
INCLUDE="-I$srcdir/include"
if test x$srcdir != x.; then
    INCLUDE="-Iinclude $INCLUDE"
elif test -d .hg; then
    AC_MSG_ERROR([
*** When building from Mercurial you should configure and build in a
    separate directory so you don't clobber SDL_config.h, SDL_revision.h
])
fi
BASE_CFLAGS=""
BASE_LDFLAGS=""
case "$host" in
    *-*-cygwin*)
        # We build SDL on cygwin without the UNIX emulation layer
        save_CFLAGS="$CFLAGS"
        have_no_cygwin=no
        AC_MSG_CHECKING(for GCC -mno-cygwin option)
        CFLAGS="$save_CFLAGS -mno-cygwin"

        AC_TRY_COMPILE([
        ],[
        ],[
        have_no_cygwin=yes
        ])
        AC_MSG_RESULT($have_no_cygwin)
        CFLAGS="$save_CFLAGS"

        if test x$have_no_cygwin = xyes; then
            BASE_CFLAGS="-mno-cygwin"
            BASE_LDFLAGS="-mno-cygwin"
        fi
        BASE_CFLAGS="$BASE_CFLAGS -I/usr/include/mingw"
        ;;
esac
# Uncomment the following line if you want to force SDL and applications
# built with it to be compiled for a particular architecture.
#AX_GCC_ARCHFLAG([no], [BASE_CFLAGS="$BASE_CFLAGS $ax_cv_gcc_archflag]")
BUILD_CFLAGS="$CFLAGS $CPPFLAGS -DUSING_GENERATED_CONFIG_H"
# The default optimization for SDL is -O3 (Bug #31)
if test "x$orig_CFLAGS" = x; then
    BUILD_CFLAGS=`echo $BUILD_CFLAGS | sed 's/-O2/-O3/'`
fi
EXTRA_CFLAGS="$INCLUDE $BASE_CFLAGS"
BUILD_LDFLAGS="$LDFLAGS"
EXTRA_LDFLAGS="$BASE_LDFLAGS"
## These are common directories to find software packages
#for path in /usr/freeware /usr/pkg /usr/X11R6 /usr/local; do
#    if test -d $path/include; then
#        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$path/include"
#    fi
#    if test -d $path/lib; then
#        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -L$path/lib"
#    fi
#done
SDL_CFLAGS="$BASE_CFLAGS"
SDL_LIBS="-lSDL2 $BASE_LDFLAGS"
CPPFLAGS="$CPPFLAGS $EXTRA_CFLAGS"
CFLAGS="$CFLAGS $EXTRA_CFLAGS"
LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"

dnl set this to use on systems that use lib64 instead of lib
base_libdir=`echo \${libdir} | sed 's/.*\/\(.*\)/\1/; q'`

dnl Function to find a library in the compiler search path
find_lib()
{
    gcc_bin_path=[`$CC -print-search-dirs 2>/dev/null | fgrep programs: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
    gcc_lib_path=[`$CC -print-search-dirs 2>/dev/null | fgrep libraries: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
    env_lib_path=[`echo $LIBS $LDFLAGS $* | sed 's/-L[ ]*//g'`]
    if test "$cross_compiling" = yes; then
        host_lib_path=""
    else
        host_lib_path="/usr/$base_libdir /usr/local/$base_libdir"
    fi
    for path in $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
        lib=[`ls -- $path/$1 2>/dev/null | sed -e '/\.so\..*\./d' -e 's,.*/,,' | sort | tail -1`]
        if test x$lib != x; then
            echo $lib
            return
        fi
    done
}

dnl Check for compiler characteristics
AC_C_CONST
AC_C_INLINE
AC_C_VOLATILE

dnl See whether we want assertions for debugging/sanity checking SDL itself.
AC_ARG_ENABLE(assertions,
AC_HELP_STRING([--enable-assertions],
               [Enable internal sanity checks (auto/disabled/release/enabled/paranoid) [[default=auto]]]),
              , enable_assertions=auto)
case "$enable_assertions" in
    auto) # Use optimization settings to determine assertion level
        ;;
    disabled)
        AC_DEFINE(SDL_DEFAULT_ASSERT_LEVEL, 0, [ ])
        ;;
    release)
        AC_DEFINE(SDL_DEFAULT_ASSERT_LEVEL, 1, [ ])
        ;;
    enabled)
        AC_DEFINE(SDL_DEFAULT_ASSERT_LEVEL, 2, [ ])
        ;;
    paranoid)
        AC_DEFINE(SDL_DEFAULT_ASSERT_LEVEL, 3, [ ])
        ;;
    *)
        AC_MSG_ERROR([*** unknown assertion level. stop.])
        ;;
esac

dnl See whether we can use gcc style dependency tracking
AC_ARG_ENABLE(dependency-tracking,
AC_HELP_STRING([--enable-dependency-tracking],
               [Use gcc -MMD -MT dependency tracking [[default=yes]]]),
              , enable_dependency_tracking=yes)
if test x$enable_dependency_tracking = xyes; then
    have_gcc_mmd_mt=no
    AC_MSG_CHECKING(for GCC -MMD -MT option)
    AC_TRY_COMPILE([
    #if !defined(__GNUC__) || __GNUC__ < 3
    #error Dependency tracking requires GCC 3.0 or newer
    #endif
    ],[
    ],[
    have_gcc_mmd_mt=yes
    ])
    AC_MSG_RESULT($have_gcc_mmd_mt)

    if test x$have_gcc_mmd_mt = xyes; then
        DEPENDENCY_TRACKING_OPTIONS="-MMD -MT \$@"
    fi
fi

AC_MSG_CHECKING(for linker option --no-undefined)
have_no_undefined=no
case "$host" in
    dnl Skip this on platforms where it is just simply busted.
    *-*-openbsd*)
        ;;

    *)
        save_LDFLAGS="$LDFLAGS"
        LDFLAGS="$LDFLAGS -Wl,--no-undefined"
        AC_TRY_LINK([
        ],[
        ],[
        have_no_undefined=yes
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--no-undefined"
        ])
        LDFLAGS="$save_LDFLAGS"
        ;;
esac
AC_MSG_RESULT($have_no_undefined)

dnl See whether we are allowed to use the system C library
AC_ARG_ENABLE(libc,
AC_HELP_STRING([--enable-libc], [Use the system C library [[default=yes]]]),
              , enable_libc=yes)
if test x$enable_libc = xyes; then
    AC_DEFINE(HAVE_LIBC, 1, [ ])

    dnl Check for C library headers
    AC_HEADER_STDC
    AC_CHECK_HEADERS(sys/types.h stdio.h stdlib.h stddef.h stdarg.h malloc.h memory.h string.h strings.h inttypes.h stdint.h ctype.h math.h iconv.h signal.h)

    dnl Check for typedefs, structures, etc.
    AC_TYPE_SIZE_T

    dnl Check for defines
    AC_CHECK_DEFINE(M_PI, math.h)

    dnl Checks for library functions.
    case "$host" in
    *-*-cygwin* | *-*-mingw32*)
        ;;
    *)
        AC_FUNC_ALLOCA
        ;;
    esac

    AC_FUNC_MEMCMP
    if test x$ac_cv_func_memcmp_working = xyes; then
        AC_DEFINE(HAVE_MEMCMP, 1, [ ])
    fi
    AC_FUNC_STRTOD
    if test x$ac_cv_func_strtod = xyes; then
        AC_DEFINE(HAVE_STRTOD, 1, [ ])
    fi
    AC_CHECK_FUNC(mprotect,
        AC_TRY_COMPILE([
          #include <sys/types.h>
          #include <sys/mman.h>
        ],[
        ],[
        AC_DEFINE(HAVE_MPROTECT, 1, [ ])
        ]),
    )
    AC_CHECK_FUNCS(malloc calloc realloc free getenv setenv putenv unsetenv qsort abs bcopy memset memcpy memmove strlen strlcpy strlcat strdup _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp vsscanf vsnprintf fseeko fseeko64 sigaction setjmp nanosleep sysconf sysctlbyname)

    AC_CHECK_LIB(m, pow, [LIBS="$LIBS -lm"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"])
    AC_CHECK_FUNCS(atan atan2 acos asin ceil copysign cos cosf fabs floor log pow scalbn sin sinf sqrt sqrtf tan tanf)

    AC_CHECK_LIB(iconv, iconv_open, [LIBS="$LIBS -liconv"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -liconv"])
    AC_CHECK_FUNCS(iconv)

    AC_CHECK_MEMBER(struct sigaction.sa_sigaction,[AC_DEFINE(HAVE_SA_SIGACTION)], ,[#include <signal.h>])
fi

dnl AC_CHECK_SIZEOF(void*)

dnl See whether we can use gcc atomic operations on this architecture
AC_ARG_ENABLE(gcc-atomics,
AC_HELP_STRING([--enable-gcc-atomics],
               [Use gcc builtin atomics [[default=yes]]]),
              , enable_gcc_atomics=yes)
if test x$enable_gcc_atomics = xyes; then
    have_gcc_atomics=no
    AC_MSG_CHECKING(for GCC builtin atomic operations)
    AC_TRY_LINK([
    ],[
    int a;
    void *x, *y, *z;
    __sync_lock_test_and_set(&a, 4);
    __sync_lock_test_and_set(&x, y);
    __sync_fetch_and_add(&a, 1);
    __sync_bool_compare_and_swap(&a, 5, 10);
    __sync_bool_compare_and_swap(&x, y, z);
    ],[
    have_gcc_atomics=yes
    ])
    AC_MSG_RESULT($have_gcc_atomics)

    if test x$have_gcc_atomics = xyes; then
        AC_DEFINE(HAVE_GCC_ATOMICS, 1, [ ])
    else
        # See if we have the minimum operation needed for GCC atomics
        AC_TRY_LINK([
        ],[
        int a;
        __sync_lock_test_and_set(&a, 1);
        __sync_lock_release(&a);
        ],[
        have_gcc_sync_lock_test_and_set=yes
        ])
        if test x$have_gcc_sync_lock_test_and_set = xyes; then
            AC_DEFINE(HAVE_GCC_SYNC_LOCK_TEST_AND_SET, 1, [ ])
        fi
    fi
fi

# Standard C sources
SOURCES="$SOURCES $srcdir/src/*.c"
SOURCES="$SOURCES $srcdir/src/atomic/*.c"
SOURCES="$SOURCES $srcdir/src/audio/*.c"
SOURCES="$SOURCES $srcdir/src/cpuinfo/*.c"
SOURCES="$SOURCES $srcdir/src/dynapi/*.c"
SOURCES="$SOURCES $srcdir/src/events/*.c"
SOURCES="$SOURCES $srcdir/src/file/*.c"
SOURCES="$SOURCES $srcdir/src/haptic/*.c"
SOURCES="$SOURCES $srcdir/src/joystick/*.c"
SOURCES="$SOURCES $srcdir/src/libm/*.c"
SOURCES="$SOURCES $srcdir/src/power/*.c"
#SOURCES="$SOURCES $srcdir/src/filesystem/*.c"
SOURCES="$SOURCES $srcdir/src/render/*.c"
SOURCES="$SOURCES $srcdir/src/render/*/*.c"
SOURCES="$SOURCES $srcdir/src/stdlib/*.c"
SOURCES="$SOURCES $srcdir/src/thread/*.c"
SOURCES="$SOURCES $srcdir/src/timer/*.c"
SOURCES="$SOURCES $srcdir/src/video/*.c"

dnl Enable/disable various subsystems of the SDL library

AC_ARG_ENABLE(atomic,
AC_HELP_STRING([--enable-atomic], [Enable the atomic operations subsystem [[default=yes]]]),
              , enable_atomic=yes)
if test x$enable_atomic != xyes; then
    AC_DEFINE(SDL_ATOMIC_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} atomic"
fi
AC_ARG_ENABLE(audio,
AC_HELP_STRING([--enable-audio], [Enable the audio subsystem [[default=yes]]]),
              , enable_audio=yes)
if test x$enable_audio != xyes; then
    AC_DEFINE(SDL_AUDIO_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} audio"
fi
AC_ARG_ENABLE(video,
AC_HELP_STRING([--enable-video], [Enable the video subsystem [[default=yes]]]),
              , enable_video=yes)
if test x$enable_video != xyes; then
    AC_DEFINE(SDL_VIDEO_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} video"
fi
AC_ARG_ENABLE(render,
AC_HELP_STRING([--enable-render], [Enable the render subsystem [[default=yes]]]),
              , enable_render=yes)
if test x$enable_render != xyes; then
    AC_DEFINE(SDL_RENDER_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} render"
fi
AC_ARG_ENABLE(events,
AC_HELP_STRING([--enable-events], [Enable the events subsystem [[default=yes]]]),
              , enable_events=yes)
if test x$enable_events != xyes; then
    AC_DEFINE(SDL_EVENTS_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} events"
fi
AC_ARG_ENABLE(joystick,
AC_HELP_STRING([--enable-joystick], [Enable the joystick subsystem [[default=yes]]]),
              , enable_joystick=yes)
if test x$enable_joystick != xyes; then
    AC_DEFINE(SDL_JOYSTICK_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} joystick"
fi
AC_ARG_ENABLE(haptic,
AC_HELP_STRING([--enable-haptic], [Enable the haptic (force feedback) subsystem [[default=yes]]]),
              , enable_haptic=yes)
if test x$enable_haptic != xyes; then
    AC_DEFINE(SDL_HAPTIC_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} haptic"
fi
AC_ARG_ENABLE(power,
AC_HELP_STRING([--enable-power], [Enable the power subsystem [[default=yes]]]),
              , enable_power=yes)
if test x$enable_power != xyes; then
    AC_DEFINE(SDL_POWER_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} power"
fi
AC_ARG_ENABLE(filesystem,
AC_HELP_STRING([--enable-filesystem], [Enable the filesystem subsystem [[default=yes]]]),
              , enable_filesystem=yes)
if test x$enable_filesystem != xyes; then
    AC_DEFINE(SDL_FILESYSTEM_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} filesystem"
fi
AC_ARG_ENABLE(threads,
AC_HELP_STRING([--enable-threads], [Enable the threading subsystem [[default=yes]]]),
              , enable_threads=yes)
if test x$enable_threads != xyes; then
    AC_DEFINE(SDL_THREADS_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} threads"
fi
AC_ARG_ENABLE(timers,
AC_HELP_STRING([--enable-timers], [Enable the timer subsystem [[default=yes]]]),
              , enable_timers=yes)
if test x$enable_timers != xyes; then
    AC_DEFINE(SDL_TIMERS_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} timers"
fi
AC_ARG_ENABLE(file,
AC_HELP_STRING([--enable-file], [Enable the file subsystem [[default=yes]]]),
              , enable_file=yes)
if test x$enable_file != xyes; then
    AC_DEFINE(SDL_FILE_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} file"
fi
AC_ARG_ENABLE(loadso,
AC_HELP_STRING([--enable-loadso], [Enable the shared object loading subsystem [[default=yes]]]),
              , enable_loadso=yes)
if test x$enable_loadso != xyes; then
    AC_DEFINE(SDL_LOADSO_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} loadso"
fi
AC_ARG_ENABLE(cpuinfo,
AC_HELP_STRING([--enable-cpuinfo], [Enable the cpuinfo subsystem [[default=yes]]]),
              , enable_cpuinfo=yes)
if test x$enable_cpuinfo != xyes; then
    AC_DEFINE(SDL_CPUINFO_DISABLED, 1, [ ])
else
    SUMMARY_modules="${SUMMARY_modules} cpuinfo"
fi
AC_ARG_ENABLE(assembly,
AC_HELP_STRING([--enable-assembly], [Enable assembly routines [[default=yes]]]),
              , enable_assembly=yes)
if test x$enable_assembly = xyes; then
    SUMMARY_modules="${SUMMARY_modules} assembly"

    AC_DEFINE(SDL_ASSEMBLY_ROUTINES, 1, [ ])

    # Make sure that we don't generate floating point code that would
    # cause illegal instruction exceptions on older processors
    case "$host" in
        *-*-darwin*)
            # Don't need to worry about Apple hardware, it's all SSE capable
            default_ssemath=yes
            ;;
        *64-*-*)
            # x86 64-bit architectures all have SSE instructions
            default_ssemath=yes
            ;;
        *)
            default_ssemath=no
            ;;
    esac
    AC_ARG_ENABLE(ssemath,
AC_HELP_STRING([--enable-ssemath], [Allow GCC to use SSE floating point math [[default=no]]]),
                  , enable_ssemath=$default_ssemath)
    if test x$enable_ssemath = xno; then
        if test x$have_gcc_sse = xyes -o x$have_gcc_sse2 = xyes; then
            EXTRA_CFLAGS="$EXTRA_CFLAGS -mfpmath=387"
        fi
    fi

    dnl Check for various instruction support
    AC_ARG_ENABLE(mmx,
AC_HELP_STRING([--enable-mmx], [use MMX assembly routines [[default=yes]]]),
                  , enable_mmx=yes)
    if test x$enable_mmx = xyes; then
        save_CFLAGS="$CFLAGS"
        have_gcc_mmx=no
        AC_MSG_CHECKING(for GCC -mmmx option)
        mmx_CFLAGS="-mmmx"
        CFLAGS="$save_CFLAGS $mmx_CFLAGS"

        AC_TRY_COMPILE([
        #ifdef __MINGW32__
        #include <_mingw.h>
        #ifdef __MINGW64_VERSION_MAJOR
        #include <intrin.h>
        #else
        #include <mmintrin.h>
        #endif
        #else
        #include <mmintrin.h>
        #endif
        #ifndef __MMX__
        #error Assembler CPP flag not enabled
        #endif
        ],[
        ],[
        have_gcc_mmx=yes
        ])
        AC_MSG_RESULT($have_gcc_mmx)
        CFLAGS="$save_CFLAGS"

        if test x$have_gcc_mmx = xyes; then
            EXTRA_CFLAGS="$EXTRA_CFLAGS $mmx_CFLAGS"
            SUMMARY_math="${SUMMARY_math} mmx"
        fi
    fi

    AC_ARG_ENABLE(3dnow,
AC_HELP_STRING([--enable-3dnow], [use 3DNow! assembly routines [[default=yes]]]),
                  , enable_3dnow=yes)
    if test x$enable_3dnow = xyes; then
        save_CFLAGS="$CFLAGS"
        have_gcc_3dnow=no
        AC_MSG_CHECKING(for GCC -m3dnow option)
        amd3dnow_CFLAGS="-m3dnow"
        CFLAGS="$save_CFLAGS $amd3dnow_CFLAGS"

        AC_TRY_LINK([
        #include <mm3dnow.h>
        #ifndef __3dNOW__
        #error Assembler CPP flag not enabled
        #endif
        ],[
        void *p = 0;
        _m_prefetch(p);
        ],[
        have_gcc_3dnow=yes
        ])
        AC_MSG_RESULT($have_gcc_3dnow)
        CFLAGS="$save_CFLAGS"

        if test x$have_gcc_3dnow = xyes; then
            EXTRA_CFLAGS="$EXTRA_CFLAGS $amd3dnow_CFLAGS"
            SUMMARY_math="${SUMMARY_math} 3dnow"
        fi
    fi

    AC_ARG_ENABLE(sse,
AC_HELP_STRING([--enable-sse], [use SSE assembly routines [[default=yes]]]),
                  , enable_sse=yes)
    if test x$enable_sse = xyes; then
        save_CFLAGS="$CFLAGS"
        have_gcc_sse=no
        AC_MSG_CHECKING(for GCC -msse option)
        sse_CFLAGS="-msse"
        CFLAGS="$save_CFLAGS $sse_CFLAGS"

        AC_TRY_COMPILE([
        #ifdef __MINGW32__
        #include <_mingw.h>
        #ifdef __MINGW64_VERSION_MAJOR
        #include <intrin.h>
        #else
        #include <xmmintrin.h>
        #endif
        #else
        #include <xmmintrin.h>
        #endif
        #ifndef __SSE__
        #error Assembler CPP flag not enabled
        #endif
        ],[
        ],[
        have_gcc_sse=yes
        ])
        AC_MSG_RESULT($have_gcc_sse)
        CFLAGS="$save_CFLAGS"

        if test x$have_gcc_sse = xyes; then
            EXTRA_CFLAGS="$EXTRA_CFLAGS $sse_CFLAGS"
            SUMMARY_math="${SUMMARY_math} sse"
        fi
    fi

    AC_ARG_ENABLE(sse2,
AC_HELP_STRING([--enable-sse2], [use SSE2 assembly routines [[default=no]]]),
                  , enable_sse2=$default_ssemath)
    if test x$enable_sse2 = xyes; then
        save_CFLAGS="$CFLAGS"
        have_gcc_sse2=no
        AC_MSG_CHECKING(for GCC -msse2 option)
        sse2_CFLAGS="-msse2"
        CFLAGS="$save_CFLAGS $sse2_CFLAGS"

        AC_TRY_COMPILE([
        #ifdef __MINGW32__
        #include <_mingw.h>
        #ifdef __MINGW64_VERSION_MAJOR
        #include <intrin.h>
        #else
        #include <emmintrin.h>
        #endif
        #else
        #include <emmintrin.h>
        #endif
        #ifndef __SSE2__
        #error Assembler CPP flag not enabled
        #endif
        ],[
        ],[
        have_gcc_sse2=yes
        ])
        AC_MSG_RESULT($have_gcc_sse2)
        CFLAGS="$save_CFLAGS"

        if test x$have_gcc_sse2 = xyes; then
            EXTRA_CFLAGS="$EXTRA_CFLAGS $sse2_CFLAGS"
            SUMMARY_math="${SUMMARY_math} sse2"
        fi
    fi

    AC_ARG_ENABLE(altivec,
AC_HELP_STRING([--enable-altivec], [use Altivec assembly routines [[default=yes]]]),
                  , enable_altivec=yes)
    if test x$enable_altivec = xyes; then
        save_CFLAGS="$CFLAGS"
        have_gcc_altivec=no
        have_altivec_h_hdr=no
        altivec_CFLAGS="-maltivec"
        CFLAGS="$save_CFLAGS $altivec_CFLAGS"

        AC_MSG_CHECKING(for Altivec with GCC altivec.h and -maltivec option)
        AC_TRY_COMPILE([
        #include <altivec.h>
        vector unsigned int vzero() {
            return vec_splat_u32(0);
        }
        ],[
        ],[
        have_gcc_altivec=yes
        have_altivec_h_hdr=yes
        ])
        AC_MSG_RESULT($have_gcc_altivec)

        if test x$have_gcc_altivec = xno; then
            AC_MSG_CHECKING(for Altivec with GCC -maltivec option)
            AC_TRY_COMPILE([
            vector unsigned int vzero() {
                return vec_splat_u32(0);
            }
            ],[
            ],[
            have_gcc_altivec=yes
            ])
            AC_MSG_RESULT($have_gcc_altivec)
        fi

        if test x$have_gcc_altivec = xno; then
            AC_MSG_CHECKING(for Altivec with GCC altivec.h and -faltivec option)
            altivec_CFLAGS="-faltivec"
            CFLAGS="$save_CFLAGS $altivec_CFLAGS"
            AC_TRY_COMPILE([
            #include <altivec.h>
            vector unsigned int vzero() {
                return vec_splat_u32(0);
            }
            ],[
            ],[
            have_gcc_altivec=yes
            have_altivec_h_hdr=yes
            ])
            AC_MSG_RESULT($have_gcc_altivec)
        fi

        if test x$have_gcc_altivec = xno; then
            AC_MSG_CHECKING(for Altivec with GCC -faltivec option)
            AC_TRY_COMPILE([
            vector unsigned int vzero() {
                return vec_splat_u32(0);
            }
            ],[
            ],[
            have_gcc_altivec=yes
            ])
            AC_MSG_RESULT($have_gcc_altivec)
        fi
        CFLAGS="$save_CFLAGS"

        if test x$have_gcc_altivec = xyes; then
            AC_DEFINE(SDL_ALTIVEC_BLITTERS, 1, [ ])
            if test x$have_altivec_h_hdr = xyes; then
              AC_DEFINE(HAVE_ALTIVEC_H, 1, [ ])
            fi
            EXTRA_CFLAGS="$EXTRA_CFLAGS $altivec_CFLAGS"
            SUMMARY_math="${SUMMARY_math} altivec"
        fi
    fi
fi

dnl See if the OSS audio interface is supported
CheckOSS()
{
    AC_ARG_ENABLE(oss,
AC_HELP_STRING([--enable-oss], [support the OSS audio API [[default=maybe]]]),
                  , enable_oss=maybe)

    # OpenBSD "has" OSS, but it's not really for app use. They want you to
    #  use sndio instead. So on there, we default to disabled. You can force
    #  it on if you really want, though.
    if test x$enable_oss = xmaybe; then
        enable_oss=yes
        case "$host" in
            *-*-openbsd*)
                enable_oss=no;;
        esac
    fi

    if test x$enable_audio = xyes -a x$enable_oss = xyes; then
        AC_MSG_CHECKING(for OSS audio support)
        have_oss=no
        if test x$have_oss != xyes; then
            AC_TRY_COMPILE([
              #include <sys/soundcard.h>
            ],[
              int arg = SNDCTL_DSP_SETFRAGMENT;
            ],[
            have_oss=yes
            ])
        fi
        if test x$have_oss != xyes; then
            AC_TRY_COMPILE([
              #include <soundcard.h>
            ],[
              int arg = SNDCTL_DSP_SETFRAGMENT;
            ],[
            have_oss=yes
            AC_DEFINE(SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H, 1, [ ])
            ])
        fi
        AC_MSG_RESULT($have_oss)
        if test x$have_oss = xyes; then
            SUMMARY_audio="${SUMMARY_audio} oss"
            AC_DEFINE(SDL_AUDIO_DRIVER_OSS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/dsp/*.c"
            have_audio=yes

            # We may need to link with ossaudio emulation library
            case "$host" in
                *-*-openbsd*|*-*-netbsd*)
                    EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lossaudio";;
            esac
        fi
    fi
}

dnl See if the ALSA audio interface is supported
CheckALSA()
{
    AC_ARG_ENABLE(alsa,
AC_HELP_STRING([--enable-alsa], [support the ALSA audio API [[default=yes]]]),
                  , enable_alsa=yes)
    if test x$enable_audio = xyes -a x$enable_alsa = xyes; then
        AM_PATH_ALSA(0.9.0, have_alsa=yes, have_alsa=no)
        # Restore all flags from before the ALSA detection runs
        CFLAGS="$alsa_save_CFLAGS"
        LDFLAGS="$alsa_save_LDFLAGS"
        LIBS="$alsa_save_LIBS"
        if test x$have_alsa = xyes; then
            AC_ARG_ENABLE(alsa-shared,
AC_HELP_STRING([--enable-alsa-shared], [dynamically load ALSA audio support [[default=yes]]]),
                          , enable_alsa_shared=yes)
            alsa_lib=[`find_lib "libasound.so.*" "$ALSA_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]

            AC_DEFINE(SDL_AUDIO_DRIVER_ALSA, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/alsa/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $ALSA_CFLAGS"
            if test x$have_loadso != xyes && \
               test x$enable_alsa_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic ALSA loading])
            fi
            if test x$have_loadso = xyes && \
               test x$enable_alsa_shared = xyes && test x$alsa_lib != x; then
                echo "-- dynamic libasound -> $alsa_lib"
                AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_ALSA_DYNAMIC, "$alsa_lib", [ ])
                SUMMARY_audio="${SUMMARY_audio} alsa(dynamic)"
            else
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $ALSA_LIBS"
                SUMMARY_audio="${SUMMARY_audio} alsa"
            fi
            have_audio=yes
        fi
    fi
}

dnl Find the ESD includes and libraries
CheckESD()
{
    AC_ARG_ENABLE(esd,
AC_HELP_STRING([--enable-esd], [support the Enlightened Sound Daemon [[default=yes]]]),
                  , enable_esd=yes)
    if test x$enable_audio = xyes -a x$enable_esd = xyes; then
        AM_PATH_ESD(0.2.8, have_esd=yes, have_esd=no)
        if test x$have_esd = xyes; then
            AC_ARG_ENABLE(esd-shared,
AC_HELP_STRING([--enable-esd-shared], [dynamically load ESD audio support [[default=yes]]]),
                          , enable_esd_shared=yes)
            esd_lib=[`find_lib "libesd.so.*" "$ESD_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]

            AC_DEFINE(SDL_AUDIO_DRIVER_ESD, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/esd/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $ESD_CFLAGS"
            if test x$have_loadso != xyes && \
               test x$enable_esd_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic ESD loading])
            fi
            if test x$have_loadso = xyes && \
               test x$enable_esd_shared = xyes && test x$esd_lib != x; then
                echo "-- dynamic libesd -> $esd_lib"
                AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_ESD_DYNAMIC, "$esd_lib", [ ])
                SUMMARY_audio="${SUMMARY_audio} esd(dynamic)"
            else
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $ESD_LIBS"
                SUMMARY_audio="${SUMMARY_audio} esd"
            fi
            have_audio=yes
        fi
    fi
}

dnl Find PulseAudio
CheckPulseAudio()
{
    AC_ARG_ENABLE(pulseaudio,
AC_HELP_STRING([--enable-pulseaudio], [use PulseAudio [[default=yes]]]),
                  , enable_pulseaudio=yes)
    if test x$enable_audio = xyes -a x$enable_pulseaudio = xyes; then
        audio_pulseaudio=no

        PULSEAUDIO_REQUIRED_VERSION=0.9

        AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
        AC_MSG_CHECKING(for PulseAudio $PULSEAUDIO_REQUIRED_VERSION support)
        if test x$PKG_CONFIG != xno; then
        if $PKG_CONFIG --atleast-pkgconfig-version 0.7 && $PKG_CONFIG --atleast-version $PULSEAUDIO_REQUIRED_VERSION libpulse-simple; then
                PULSEAUDIO_CFLAGS=`$PKG_CONFIG --cflags libpulse-simple`
                PULSEAUDIO_LIBS=`$PKG_CONFIG --libs libpulse-simple`
                audio_pulseaudio=yes
            fi
        fi
        AC_MSG_RESULT($audio_pulseaudio)

        if test x$audio_pulseaudio = xyes; then
            AC_ARG_ENABLE(pulseaudio-shared,
AC_HELP_STRING([--enable-pulseaudio-shared], [dynamically load PulseAudio support [[default=yes]]]),
                          , enable_pulseaudio_shared=yes)
            pulseaudio_lib=[`find_lib "libpulse-simple.so.*" "$PULSEAUDIO_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]

            AC_DEFINE(SDL_AUDIO_DRIVER_PULSEAUDIO, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/pulseaudio/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $PULSEAUDIO_CFLAGS"
            if test x$have_loadso != xyes && \
               test x$enable_pulseaudio_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic PulseAudio loading])
            fi
            if test x$have_loadso = xyes && \
               test x$enable_pulseaudio_shared = xyes && test x$pulseaudio_lib != x; then
                echo "-- dynamic libpulse-simple -> $pulseaudio_lib"
                AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_PULSEAUDIO_DYNAMIC, "$pulseaudio_lib", [ ])
                SUMMARY_audio="${SUMMARY_audio} pulse(dynamic)"

                case "$host" in
                    # On Solaris, pulseaudio must be linked deferred explicitly
                    # to prevent undefined symbol failures.
                    *-*-solaris*)
                        PULSEAUDIO_LIBS=`echo $PULSEAUDIO_LIBS | sed 's/\-l/-Wl,-l/g'`
                        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-zdeferred $PULSEAUDIO_LIBS -Wl,-znodeferred"
                esac
            else
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $PULSEAUDIO_LIBS"
                SUMMARY_audio="${SUMMARY_audio} pulse"
            fi
            have_audio=yes
        fi
    fi
}

CheckARTSC()
{
    AC_ARG_ENABLE(arts,
AC_HELP_STRING([--enable-arts], [support the Analog Real Time Synthesizer [[default=yes]]]),
                  , enable_arts=yes)
    if test x$enable_audio = xyes -a x$enable_arts = xyes; then
        AC_PATH_PROG(ARTSCONFIG, artsc-config)
        if test x$ARTSCONFIG = x -o x$ARTSCONFIG = x'"$ARTSCONFIG"'; then
            : # arts isn't installed
        else
            ARTS_CFLAGS=`$ARTSCONFIG --cflags`
            ARTS_LIBS=`$ARTSCONFIG --libs`
            AC_MSG_CHECKING(for aRts development environment)
            audio_arts=no
            save_CFLAGS="$CFLAGS"
            CFLAGS="$CFLAGS $ARTS_CFLAGS"
            AC_TRY_COMPILE([
             #include <artsc.h>
            ],[
             arts_stream_t stream;
            ],[
            audio_arts=yes
            ])
            CFLAGS="$save_CFLAGS"
            AC_MSG_RESULT($audio_arts)
            if test x$audio_arts = xyes; then
                AC_ARG_ENABLE(arts-shared,
AC_HELP_STRING([--enable-arts-shared], [dynamically load aRts audio support [[default=yes]]]),
                              , enable_arts_shared=yes)
                arts_lib=[`find_lib "libartsc.so.*" "$ARTS_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]

                AC_DEFINE(SDL_AUDIO_DRIVER_ARTS, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/audio/arts/*.c"
                EXTRA_CFLAGS="$EXTRA_CFLAGS $ARTS_CFLAGS"
                if test x$have_loadso != xyes && \
                   test x$enable_arts_shared = xyes; then
                    AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic ARTS loading])
                fi
                if test x$have_loadso = xyes && \
                   test x$enable_arts_shared = xyes && test x$arts_lib != x; then
                    echo "-- dynamic libartsc -> $arts_lib"
                    AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_ARTS_DYNAMIC, "$arts_lib", [ ])
                    SUMMARY_audio="${SUMMARY_audio} arts(dynamic)"
                else
                    EXTRA_LDFLAGS="$EXTRA_LDFLAGS $ARTS_LIBS"
                    SUMMARY_audio="${SUMMARY_audio} arts"
                fi
                have_audio=yes
            fi
        fi
    fi
}

dnl See if the NAS audio interface is supported
CheckNAS()
{
    AC_ARG_ENABLE(nas,
AC_HELP_STRING([--enable-nas], [support the NAS audio API [[default=yes]]]),
                  , enable_nas=yes)
    if test x$enable_audio = xyes -a x$enable_nas = xyes; then
        AC_CHECK_HEADER(audio/audiolib.h, have_nas_hdr=yes)
        AC_CHECK_LIB(audio, AuOpenServer, have_nas_lib=yes)

        AC_MSG_CHECKING(for NAS audio support)
        have_nas=no

        if test x$have_nas_hdr = xyes -a x$have_nas_lib = xyes; then
            have_nas=yes
            NAS_LIBS="-laudio"

        elif test -r /usr/X11R6/include/audio/audiolib.h; then
            have_nas=yes
            NAS_CFLAGS="-I/usr/X11R6/include/"
            NAS_LIBS="-L/usr/X11R6/lib -laudio -lXt"

        fi

        AC_MSG_RESULT($have_nas)

        if test x$have_nas = xyes; then
            AC_ARG_ENABLE(nas-shared,
AC_HELP_STRING([--enable-nas-shared], [dynamically load NAS audio support [[default=yes]]]),
                          , enable_nas_shared=yes)
            nas_lib=[`find_lib "libaudio.so.*" "$NAS_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]

            if test x$have_loadso != xyes && \
               test x$enable_nas_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic NAS loading])
            fi
            if test x$have_loadso = xyes && \
               test x$enable_nas_shared = xyes && test x$nas_lib != x; then
                echo "-- dynamic libaudio -> $nas_lib"
                AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_NAS_DYNAMIC, "$nas_lib", [ ])
                SUMMARY_audio="${SUMMARY_audio} nas(dynamic)"
            else
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $NAS_LIBS"
                SUMMARY_audio="${SUMMARY_audio} nas"
            fi

            AC_DEFINE(SDL_AUDIO_DRIVER_NAS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/nas/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $NAS_CFLAGS"
            have_audio=yes
        fi
    fi
}

dnl See if the sndio audio interface is supported
CheckSNDIO()
{
    AC_ARG_ENABLE(sndio,
AC_HELP_STRING([--enable-sndio], [support the sndio audio API [[default=yes]]]),
                  , enable_sndio=yes)
    if test x$enable_audio = xyes -a x$enable_sndio = xyes; then
        AC_CHECK_HEADER(sndio.h, have_sndio_hdr=yes)
        AC_CHECK_LIB(sndio, sio_open, have_sndio_lib=yes)

        AC_MSG_CHECKING(for sndio audio support)
        have_sndio=no

        if test x$have_sndio_hdr = xyes -a x$have_sndio_lib = xyes; then
            have_sndio=yes
            SNDIO_LIBS="-lsndio"
        fi

        AC_MSG_RESULT($have_sndio)

        if test x$have_sndio = xyes; then
            AC_ARG_ENABLE(sndio-shared,
AC_HELP_STRING([--enable-sndio-shared], [dynamically load sndio audio support [[default=yes]]]),
                          , enable_sndio_shared=yes)
            sndio_lib=[`find_lib "libsndio.so.*" "$SNDIO_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]

            if test x$have_loadso != xyes && \
               test x$enable_sndio_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic sndio loading])
            fi
            if test x$have_loadso = xyes && \
               test x$enable_sndio_shared = xyes && test x$sndio_lib != x; then
                echo "-- dynamic libsndio -> $sndio_lib"
                AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_SNDIO_DYNAMIC, "$sndio_lib", [ ])
                SUMMARY_audio="${SUMMARY_audio} sndio(dynamic)"
            else
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $SNDIO_LIBS"
                SUMMARY_audio="${SUMMARY_audio} sndio"
            fi

            AC_DEFINE(SDL_AUDIO_DRIVER_SNDIO, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/sndio/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $SNDIO_CFLAGS"
            have_audio=yes
        fi
    fi
}

dnl rcg07142001 See if the user wants the disk writer audio driver...
CheckDiskAudio()
{
    AC_ARG_ENABLE(diskaudio,
AC_HELP_STRING([--enable-diskaudio], [support the disk writer audio driver [[default=yes]]]),
                  , enable_diskaudio=yes)
    if test x$enable_audio = xyes -a x$enable_diskaudio = xyes; then
        AC_DEFINE(SDL_AUDIO_DRIVER_DISK, 1, [ ])
        SOURCES="$SOURCES $srcdir/src/audio/disk/*.c"
        SUMMARY_audio="${SUMMARY_audio} disk"
    fi
}

dnl rcg03142006 See if the user wants the dummy audio driver...
CheckDummyAudio()
{
    AC_ARG_ENABLE(dummyaudio,
AC_HELP_STRING([--enable-dummyaudio], [support the dummy audio driver [[default=yes]]]),
                  , enable_dummyaudio=yes)
    if test x$enable_audio = xyes -a x$enable_dummyaudio = xyes; then
        AC_DEFINE(SDL_AUDIO_DRIVER_DUMMY, 1, [ ])
        SOURCES="$SOURCES $srcdir/src/audio/dummy/*.c"
        SUMMARY_audio="${SUMMARY_audio} dummy"
    fi
}

dnl See if GCC's -fvisibility=hidden is supported (gcc4 and later, usually).
dnl  Details of this flag are here: http://gcc.gnu.org/wiki/Visibility
CheckVisibilityHidden()
{
    AC_MSG_CHECKING(for GCC -fvisibility=hidden option)
    have_gcc_fvisibility=no

    visibility_CFLAGS="-fvisibility=hidden"
    save_CFLAGS="$CFLAGS"
    CFLAGS="$save_CFLAGS $visibility_CFLAGS -Werror"
    AC_TRY_COMPILE([
    #if !defined(__GNUC__) || __GNUC__ < 4
    #error SDL only uses visibility attributes in GCC 4 or newer
    #endif
    ],[
    ],[
    have_gcc_fvisibility=yes
    ])
    AC_MSG_RESULT($have_gcc_fvisibility)
    CFLAGS="$save_CFLAGS"

    if test x$have_gcc_fvisibility = xyes; then
        EXTRA_CFLAGS="$EXTRA_CFLAGS $visibility_CFLAGS"
    fi
}

dnl See if GCC's -mpreferred-stack-boundary is supported.
dnl  Reference: http://bugzilla.libsdl.org/show_bug.cgi?id=1296
CheckStackBoundary()
{
    AC_MSG_CHECKING(for GCC -mpreferred-stack-boundary option)
    have_gcc_preferred_stack_boundary=no

    save_CFLAGS="$CFLAGS"
    CFLAGS="$save_CFLAGS -mpreferred-stack-boundary=2"
    AC_TRY_COMPILE([
    int x = 0;
    ],[
    ],[
    have_gcc_preferred_stack_boundary=yes
    ])
    AC_MSG_RESULT($have_gcc_preferred_stack_boundary)
    CFLAGS="$save_CFLAGS"

    if test x$have_gcc_preferred_stack_boundary = xyes; then
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mpreferred-stack-boundary=2"
    fi
}

dnl See if GCC's -Wall is supported.
CheckWarnAll()
{
    AC_MSG_CHECKING(for GCC -Wall option)
    have_gcc_Wall=no

    save_CFLAGS="$CFLAGS"
    CFLAGS="$save_CFLAGS -Wall"
    AC_TRY_COMPILE([
    int x = 0;
    ],[
    ],[
    have_gcc_Wall=yes
    ])
    AC_MSG_RESULT($have_gcc_Wall)
    CFLAGS="$save_CFLAGS"

    if test x$have_gcc_Wall = xyes; then
        EXTRA_CFLAGS="$EXTRA_CFLAGS -Wall"

        dnl Haiku headers use multicharacter constants all over the place. Ignore these warnings when using -Wall.
        AC_MSG_CHECKING(for necessary GCC -Wno-multichar option)
        need_gcc_Wno_multichar=no
        case "$host" in
            *-*-haiku*)
                need_gcc_Wno_multichar=yes
                ;;
        esac
        AC_MSG_RESULT($need_gcc_Wno_multichar)
        if test x$need_gcc_Wno_multichar = xyes; then
            EXTRA_CFLAGS="$EXTRA_CFLAGS -Wno-multichar"
        fi
    fi
}

dnl Check for Wayland
CheckWayland()
{
    AC_ARG_ENABLE(video-wayland,
AC_HELP_STRING([--enable-video-wayland], [use Wayland video driver [[default=yes]]]),
                  ,enable_video_wayland=yes)

    AC_ARG_ENABLE(video-wayland-qt-touch,
AC_HELP_STRING([--enable-video-wayland-qt-touch], [QtWayland server support for Wayland video driver [[default=yes]]]),
                  ,enable_video_wayland_qt_touch=yes)

    if test x$enable_video = xyes -a x$enable_video_wayland = xyes; then
        AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
        AC_MSG_CHECKING(for Wayland support)
        video_wayland=no
        if  test x$PKG_CONFIG != xno && \
            test x$video_opengl_egl = xyes && \
            test x$video_opengles_v2 = xyes; then
            if $PKG_CONFIG --exists wayland-client wayland-egl wayland-cursor egl xkbcommon ; then
                WAYLAND_CFLAGS=`$PKG_CONFIG --cflags wayland-client wayland-egl wayland-cursor xkbcommon`
                WAYLAND_LIBS=`$PKG_CONFIG --libs wayland-client wayland-egl wayland-cursor xkbcommon`
                video_wayland=yes
            fi
        fi
        AC_MSG_RESULT($video_wayland)

        if test x$video_wayland = xyes; then
            AC_DEFINE(SDL_VIDEO_DRIVER_WAYLAND, 1, [ ])
            if test x$enable_video_wayland_qt_touch = xyes; then
                AC_DEFINE(SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH, 1, [ ])
            fi
            SOURCES="$SOURCES $srcdir/src/video/wayland/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $WAYLAND_CFLAGS"
            AC_ARG_ENABLE(wayland-shared,
AC_HELP_STRING([--enable-wayland-shared], [dynamically load Wayland support [[default=maybe]]]),
                          , enable_wayland_shared=maybe)

            dnl FIXME: Do BSD and OS X need special cases?
            case "$host" in
                *)
                    wayland_client_lib=[`find_lib "libwayland-client.so.*" "$WAYLAND_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
                    wayland_egl_lib=[`find_lib "libwayland-egl.so.*" "$WAYLAND_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
                    if test x$wayland_egl_lib = x; then
                        dnl This works in Ubuntu 13.10, maybe others
                        wayland_egl_lib=[`find_lib "mesa-egl/libwayland-egl.so.*" "$WAYLAND_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
                    fi
                    wayland_cursor_lib=[`find_lib "libwayland-cursor.so.*" "$WAYLAND_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xkbcommon_lib=[`find_lib "libxkbcommon.so.*" "$WAYLAND_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
                    ;;
            esac

            if test x$enable_wayland_shared = xmaybe; then
                enable_wayland_shared=yes
            fi
            if test x$have_loadso != xyes && \
               test x$enable_wayland_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic Wayland loading])
                enable_wayland_shared=no
            fi
            if test x$have_loadso = xyes && \
               test x$enable_wayland_shared = xyes && \
               test x$wayland_client_lib != x && \
               test x$wayland_egl_lib != x && \
               test x$wayland_cursor_lib != x && \
               test x$xkbcommon_lib != x; then
                echo "-- dynamic libwayland-client -> $wayland_client_lib"
                echo "-- dynamic libwayland-egl -> $wayland_egl_lib"
                echo "-- dynamic libwayland-cursor -> $wayland_cursor_lib"
                echo "-- dynamic libxkbcommon -> $xkbcommon_lib"
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC, "$wayland_client_lib", [ ])
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL, "$wayland_egl_lib", [ ])
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR, "$wayland_cursor_lib", [ ])
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON, "$xkbcommon_lib", [ ])
                SUMMARY_video="${SUMMARY_video} wayland(dynamic)"
            else
                enable_wayland_shared=no
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $WAYLAND_LIBS"
                SUMMARY_video="${SUMMARY_video} wayland"
            fi
            have_video=yes
        fi
    fi
}

dnl Check for Mir
CheckMir()
{
    AC_ARG_ENABLE(video-mir,
AC_HELP_STRING([--enable-video-mir], [use Mir video driver [[default=yes]]]),
                  ,enable_video_mir=yes)

    if test x$enable_video = xyes -a x$enable_video_mir = xyes; then
        AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
        AC_MSG_CHECKING(for Mir support)
        video_mir=no
        if test x$PKG_CONFIG != xno; then
            if $PKG_CONFIG --exists mirclient egl xkbcommon ; then
                MIR_CFLAGS=`$PKG_CONFIG --cflags mirclient egl xkbcommon`
                MIR_LIBS=`$PKG_CONFIG --libs mirclient egl xkbcommon`
                save_CFLAGS="$CFLAGS"
                CFLAGS="$save_CFLAGS $MIR_CFLAGS"
                
                dnl This will disable Mir on Ubuntu < 14.04
                AC_TRY_COMPILE([
                #include <mir_toolkit/mir_client_library.h>
                ],[
                    MirMotionToolType tool = mir_motion_tool_type_mouse;
                ],[
                video_mir=yes
                ])
                CFLAGS="$save_CFLAGS"
            fi
        fi
        AC_MSG_RESULT($video_mir)

        if test x$video_mir = xyes; then
            AC_DEFINE(SDL_VIDEO_DRIVER_MIR, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/video/mir/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $MIR_CFLAGS"
            AC_ARG_ENABLE(mir-shared,
AC_HELP_STRING([--enable-mir-shared], [dynamically load Mir support [[default=maybe]]]),
                          , enable_mir_shared=maybe)

            dnl FIXME: Do BSD and OS X need special cases?
            case "$host" in
                *)
                    mirclient_lib=[`find_lib "libmirclient.so.*" "$MIR_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xkbcommon_lib=[`find_lib "libxkbcommon.so.*" "$MIR_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
                    ;;
            esac

            if test x$enable_mir_shared = xmaybe; then
                enable_mir_shared=yes
            fi
            if test x$have_loadso != xyes && \
               test x$enable_mir_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic Mir loading])
                enable_mir_shared=no
            fi
            if test x$have_loadso = xyes && \
               test x$enable_mir_shared = xyes && \
               test x$mirclient_lib != x && \
               test x$xkbcommon_lib != x; then
                echo "-- dynamic libmirclient -> $mirclient_lib"
                echo "-- dynamic libxkbcommon -> $xkbcommon_lib"
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_MIR_DYNAMIC, "$mirclient_lib", [ ])
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON, "$xkbcommon_lib", [ ])
                SUMMARY_video="${SUMMARY_video} mir(dynamic)"
            else
                enable_mir_shared=no
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $MIR_LIBS"
                SUMMARY_video="${SUMMARY_video} mir"
            fi
            have_video=yes
        fi
    fi
}

dnl Check for Native Client stuff
CheckNativeClient()
{
        AC_TRY_COMPILE([
          #if !defined(__native_client__)
          #error "NO NACL"
          #endif
        ],[
        ],[
        AC_DEFINE(SDL_VIDEO_DRIVER_NACL)
        AC_DEFINE(SDL_AUDIO_DRIVER_NACL)
        AC_DEFINE(HAVE_POW, 1, [ ])
        AC_DEFINE(HAVE_OPENGLES2, 1, [ ])
        AC_DEFINE(SDL_VIDEO_OPENGL_ES2, 1, [ ])
        AC_DEFINE(SDL_VIDEO_RENDER_OGL_ES2, 1, [ ])

        SDL_LIBS="-lppapi_simple -lppapi_gles2 $SDL_LIBS"

        SDLMAIN_SOURCES="$srcdir/src/main/nacl/*.c"
        SOURCES="$SOURCES $srcdir/src/audio/nacl/*.c"
        SUMMARY_audio="${SUMMARY_audio} nacl"
        SOURCES="$SOURCES $srcdir/src/video/nacl/*.c"
        SUMMARY_video="${SUMMARY_video} nacl opengles2"
        ])
}


dnl Find the X11 include and library directories
CheckX11()
{


    AC_ARG_ENABLE(video-x11,
AC_HELP_STRING([--enable-video-x11], [use X11 video driver [[default=yes]]]),
                  , enable_video_x11=yes)
    if test x$enable_video = xyes -a x$enable_video_x11 = xyes; then
        case "$host" in
            *-*-darwin*)
                # This isn't necessary for X11, but fixes GLX detection
                if test "x$x_includes" = xNONE && \
                   test "x$x_libraries" = xNONE && \
                   test -d /usr/X11R6/include && \
                   test -d /usr/X11R6/lib; then
                    x_includes="/usr/X11R6/include"
                    x_libraries="/usr/X11R6/lib"
                fi
                ;;
        esac
        AC_PATH_X
        AC_PATH_XTRA
        if test x$have_x = xyes; then
            AC_ARG_ENABLE(x11-shared,
AC_HELP_STRING([--enable-x11-shared], [dynamically load X11 support [[default=maybe]]]),
                          , enable_x11_shared=maybe)

            case "$host" in
                *-*-darwin*)
                    x11_lib='/usr/X11R6/lib/libX11.6.dylib'
                    x11ext_lib='/usr/X11R6/lib/libXext.6.dylib'
                    xcursor_lib='/usr/X11R6/lib/libXcursor.1.dylib'
                    xinerama_lib='/usr/X11R6/lib/libXinerama.1.dylib'
                    xinput_lib='/usr/X11R6/lib/libXi.6.dylib'
                    xrandr_lib='/usr/X11R6/lib/libXrandr.2.dylib'
                    xrender_lib='/usr/X11R6/lib/libXrender.1.dylib'
                    xss_lib='/usr/X11R6/lib/libXss.1.dylib'
                    xvidmode_lib='/usr/X11R6/lib/libXxf86vm.1.dylib'
                    ;;
                *-*-openbsd*)
                    x11_lib='libX11.so'
                    x11ext_lib='libXext.so'
                    xcursor_lib='libXcursor.so'
                    xinerama_lib='libXinerama.so'
                    xinput_lib='libXi.so'
                    xrandr_lib='libXrandr.so'
                    xrender_lib='libXrender.so'
                    xss_lib='libXss.so'
                    xvidmode_lib='libXxf86vm.so'
                    ;;
                *)
                    x11_lib=[`find_lib "libX11.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    x11ext_lib=[`find_lib "libXext.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xcursor_lib=[`find_lib "libXcursor.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xinerama_lib=[`find_lib "libXinerama.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xinput_lib=[`find_lib "libXi.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xrandr_lib=[`find_lib "libXrandr.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xrender_lib=[`find_lib "libXrender.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xss_lib=[`find_lib "libXss.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    xvidmode_lib=[`find_lib "libXxf86vm.so.*" "$X_LIBS -L/usr/X11/$base_libdir -L/usr/X11R6/$base_libdir" | sed 's/.*\/\(.*\)/\1/; q'`]
                    ;;
            esac

            if test x$ac_cv_func_shmat != xyes; then
                X_CFLAGS="$X_CFLAGS -DNO_SHARED_MEMORY"
            fi
            CFLAGS="$CFLAGS $X_CFLAGS"
            LDFLAGS="$LDFLAGS $X_LIBS"

            AC_CHECK_HEADER(X11/extensions/Xext.h,
                            have_xext_h_hdr=yes,
                            have_xext_h_hdr=no,
                            [#include <X11/Xlib.h>
                             #include <X11/Xproto.h>
                            ])
            if test x$have_xext_h_hdr != xyes; then
               AC_MSG_ERROR([
*** Missing Xext.h, maybe you need to install the libxext-dev package?
               ])
            fi

            AC_DEFINE(SDL_VIDEO_DRIVER_X11, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/video/x11/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $X_CFLAGS"

            # Needed so SDL applications can include SDL_syswm.h
            SDL_CFLAGS="$SDL_CFLAGS $X_CFLAGS"

            if test x$enable_x11_shared = xmaybe; then
                enable_x11_shared=yes
            fi
            if test x$have_loadso != xyes && \
               test x$enable_x11_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic X11 loading])
                enable_x11_shared=no
            fi
            if test x$have_loadso = xyes && \
               test x$enable_x11_shared = xyes && test x$x11_lib != x && test x$x11ext_lib != x; then
                echo "-- dynamic libX11 -> $x11_lib"
                echo "-- dynamic libX11ext -> $x11ext_lib"
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC, "$x11_lib", [ ])
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT, "$x11ext_lib", [ ])
                SUMMARY_video="${SUMMARY_video} x11(dynamic)"
            else
                enable_x11_shared=no
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $X_LIBS -lX11 -lXext"
                SUMMARY_video="${SUMMARY_video} x11"
            fi
            have_video=yes

            AC_MSG_CHECKING(for const parameter to XextAddDisplay)
            have_const_param_XextAddDisplay=no
            AC_TRY_COMPILE([
              #include <X11/Xlib.h>
              #include <X11/Xproto.h>
              #include <X11/extensions/Xext.h>
              #include <X11/extensions/extutil.h>
              extern XExtDisplayInfo* XextAddDisplay(XExtensionInfo* a,Display* b,_Xconst char* c,XExtensionHooks* d,int e,XPointer f);
            ],[
            ],[
            have_const_param_XextAddDisplay=yes
            AC_DEFINE(SDL_VIDEO_DRIVER_X11_CONST_PARAM_XEXTADDDISPLAY)
            ])
            AC_MSG_RESULT($have_const_param_XextAddDisplay)

            dnl AC_CHECK_LIB(X11, XGetEventData, AC_DEFINE(SDL_VIDEO_DRIVER_X11_SUPPORTS_GENERIC_EVENTS, 1, [Have XGenericEvent]))
            AC_MSG_CHECKING([for XGenericEvent])
            have_XGenericEvent=no
            AC_TRY_COMPILE([
              	#include <X11/Xlib.h>
            ],[
Display *display;
XEvent event;
XGenericEventCookie *cookie = &event.xcookie;
XNextEvent(display, &event);
XGetEventData(display, cookie);
XFreeEventData(display, cookie);
            ],[
                have_XGenericEvent=yes
                AC_DEFINE(SDL_VIDEO_DRIVER_X11_SUPPORTS_GENERIC_EVENTS)
            ])
            AC_MSG_RESULT($have_XGenericEvent)

            AC_CHECK_LIB(X11, XkbKeycodeToKeysym, AC_DEFINE(SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM, 1, [Have XkbKeycodeToKeysym]))

            AC_ARG_ENABLE(video-x11-xcursor,
AC_HELP_STRING([--enable-video-x11-xcursor], [enable X11 Xcursor support [[default=yes]]]),
                            , enable_video_x11_xcursor=yes)
            if test x$enable_video_x11_xcursor = xyes; then
                definitely_enable_video_x11_xcursor=no
                AC_CHECK_HEADER(X11/Xcursor/Xcursor.h,
                                have_xcursor_h_hdr=yes,
                                have_xcursor_h_hdr=no,
                                [#include <X11/Xlib.h>
                                ])
                if test x$have_xcursor_h_hdr = xyes; then
                    if test x$enable_x11_shared = xyes && test x$xcursor_lib != x ; then
                        echo "-- dynamic libXcursor -> $xcursor_lib"
                        AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR, "$xcursor_lib", [ ])
                        definitely_enable_video_x11_xcursor=yes
                    else
                        AC_CHECK_LIB(Xcursor, XcursorImageCreate, have_xcursor_lib=yes)
                        if test x$have_xcursor_lib = xyes ; then
                            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lXcursor"
                            definitely_enable_video_x11_xcursor=yes
                        fi
                    fi
                fi
            fi
            if test x$definitely_enable_video_x11_xcursor = xyes; then
                AC_DEFINE(SDL_VIDEO_DRIVER_X11_XCURSOR, 1, [ ])
                SUMMARY_video_x11="${SUMMARY_video_x11} xcursor"
            fi
            AC_ARG_ENABLE(video-x11-xdbe,
AC_HELP_STRING([--enable-video-x11-xdbe], [enable X11 Xdbe support [[default=yes]]]),
                            , enable_video_x11_xdbe=yes)
            if test x$enable_video_x11_xdbe = xyes; then
                AC_CHECK_HEADER(X11/extensions/Xdbe.h,
                                have_dbe_h_hdr=yes,
                                have_dbe_h_hdr=no,
                                [#include <X11/Xlib.h>
                                ])
                if test x$have_dbe_h_hdr = xyes; then
                    AC_DEFINE(SDL_VIDEO_DRIVER_X11_XDBE, 1, [ ])
                    SUMMARY_video_x11="${SUMMARY_video_x11} xdbe"
                fi
            fi
            AC_ARG_ENABLE(video-x11-xinerama,
AC_HELP_STRING([--enable-video-x11-xinerama], [enable X11 Xinerama support [[default=yes]]]),
                            , enable_video_x11_xinerama=yes)
            if test x$enable_video_x11_xinerama = xyes; then
                definitely_enable_video_x11_xinerama=no
                AC_CHECK_HEADER(X11/extensions/Xinerama.h,
                                have_xinerama_h_hdr=yes,
                                have_xinerama_h_hdr=no,
                                [#include <X11/Xlib.h>
                                ])
                if test x$have_xinerama_h_hdr = xyes; then
                    if test x$enable_x11_shared = xyes && test x$xinerama_lib != x ; then
                        echo "-- dynamic libXinerama -> $xinerama_lib"
                        AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA, "$xinerama_lib", [ ])
                        definitely_enable_video_x11_xinerama=yes
                    else
                        AC_CHECK_LIB(Xinerama, XineramaQueryExtension, have_xinerama_lib=yes)
                        if test x$have_xinerama_lib = xyes ; then
                            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lXinerama"
                            definitely_enable_video_x11_xinerama=yes
                        fi
                    fi
                fi
            fi
            if test x$definitely_enable_video_x11_xinerama = xyes; then
                AC_DEFINE(SDL_VIDEO_DRIVER_X11_XINERAMA, 1, [ ])
                SUMMARY_video_x11="${SUMMARY_video_x11} xinerama"
            fi
            AC_ARG_ENABLE(video-x11-xinput,
AC_HELP_STRING([--enable-video-x11-xinput], [enable X11 XInput extension for manymouse, tablets, etc [[default=yes]]]),
                            , enable_video_x11_xinput=yes)
            if test x$enable_video_x11_xinput = xyes; then
                definitely_enable_video_x11_xinput=no
                AC_CHECK_HEADER(X11/extensions/XInput2.h,
                                have_xinput_h_hdr=yes,
                                have_xinput_h_hdr=no,
                                [#include <X11/Xlib.h>
                                ])
                if test x$have_xinput_h_hdr = xyes; then
                    if test x$enable_x11_shared = xyes && test x$xinput_lib != x ; then
                        echo "-- dynamic libXi -> $xinput_lib"
                        AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2, "$xinput_lib", [ ])
                        definitely_enable_video_x11_xinput=yes
                    else
                        AC_CHECK_LIB(Xi, XOpenDevice, have_xinput_lib=yes)
                        if test x$have_xinput_lib = xyes ; then
                            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lXi"
                            definitely_enable_video_x11_xinput=yes
                        fi
                    fi
                fi
            fi
            if test x$definitely_enable_video_x11_xinput = xyes; then
                SUMMARY_video_x11="${SUMMARY_video_x11} xinput2"
                AC_DEFINE(SDL_VIDEO_DRIVER_X11_XINPUT2, 1, [ ])
                AC_MSG_CHECKING(for xinput2 multitouch)
            	have_xinput2_multitouch=no
            	AC_TRY_COMPILE([
              		#include <X11/Xlib.h>
             		#include <X11/Xproto.h>
			#include <X11/extensions/XInput2.h>
            	],[
int event_type = XI_TouchBegin;
XITouchClassInfo *t;
            	],[
            	have_xinput2_multitouch=yes
            	AC_DEFINE(SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH)
                SUMMARY_video_x11="${SUMMARY_video_x11} xinput2_multitouch"
            	])
            	AC_MSG_RESULT($have_xinput2_multitouch)
            fi
            AC_ARG_ENABLE(video-x11-xrandr,
AC_HELP_STRING([--enable-video-x11-xrandr], [enable X11 Xrandr extension for fullscreen [[default=yes]]]),
                            , enable_video_x11_xrandr=yes)
            if test x$enable_video_x11_xrandr = xyes; then
                dnl XRRScreenResources is only present in Xrandr >= 1.2, we use that as a test.
                definitely_enable_video_x11_xrandr=no
                have_xrandr_h_hdr=no
                AC_TRY_COMPILE([
                #include <X11/Xlib.h>
                #include <X11/extensions/Xrandr.h>
                ],[
                XRRScreenResources *res = NULL;
                ],[
                have_xrandr_h_hdr=yes
                ])
                if test x$have_xrandr_h_hdr = xyes; then
                    if test x$enable_x11_shared = xyes && test x$xrandr_lib != x ; then
                        echo "-- dynamic libXrandr -> $xrandr_lib"
                        AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR, "$xrandr_lib", [ ])
                        definitely_enable_video_x11_xrandr=yes
                    else
                        AC_CHECK_LIB(Xrandr, XRRQueryExtension, have_xrandr_lib=yes)
                        if test x$have_xrandr_lib = xyes ; then
                            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lXrandr"
                            definitely_enable_video_x11_xrandr=yes
                        fi
                    fi
                fi
            fi
            if test x$definitely_enable_video_x11_xrandr = xyes; then
                AC_DEFINE(SDL_VIDEO_DRIVER_X11_XRANDR, 1, [ ])
                SUMMARY_video_x11="${SUMMARY_video_x11} xrandr"
            fi
            AC_ARG_ENABLE(video-x11-scrnsaver,
AC_HELP_STRING([--enable-video-x11-scrnsaver], [enable X11 screensaver extension [[default=yes]]]),
                            , enable_video_x11_scrnsaver=yes)
            if test x$enable_video_x11_scrnsaver = xyes; then
                AC_CHECK_HEADER(X11/extensions/scrnsaver.h,
                                have_scrnsaver_h_hdr=yes,
                                have_scrnsaver_h_hdr=no,
                                [#include <X11/Xlib.h>
                                ])
                if test x$have_scrnsaver_h_hdr = xyes; then
                    if test x$enable_x11_shared = xyes && test x$xss_lib != x ; then
                        echo "-- dynamic libXss -> $xss_lib"
                        AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS, "$xss_lib", [ ])
                        definitely_enable_video_x11_scrnsaver=yes
                    else
                        AC_CHECK_LIB(Xss, XScreenSaverSuspend, have_xss_lib=yes)
                        if test x$have_xss_lib = xyes ; then
                            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lXss"
                            definitely_enable_video_x11_scrnsaver=yes
                        fi
                    fi
                fi
            fi
            if test x$definitely_enable_video_x11_scrnsaver = xyes; then
                AC_DEFINE(SDL_VIDEO_DRIVER_X11_XSCRNSAVER, 1, [ ])
                SUMMARY_video_x11="${SUMMARY_video_x11} xscrnsaver"
            fi
            AC_ARG_ENABLE(video-x11-xshape,
AC_HELP_STRING([--enable-video-x11-xshape], [enable X11 XShape support [[default=yes]]]),
                            , enable_video_x11_xshape=yes)
            if test x$enable_video_x11_xshape = xyes; then
                AC_CHECK_HEADER(X11/extensions/shape.h,
                                have_shape_h_hdr=yes,
                                have_shape_h_hdr=no,
                                [#include <X11/Xlib.h>
                                ])
                if test x$have_shape_h_hdr = xyes; then
                    AC_DEFINE(SDL_VIDEO_DRIVER_X11_XSHAPE, 1, [ ])
                    SUMMARY_video_x11="${SUMMARY_video_x11} xshape"
                fi
            fi
            AC_ARG_ENABLE(video-x11-vm,
AC_HELP_STRING([--enable-video-x11-vm], [use X11 VM extension for fullscreen [[default=yes]]]),
                            , enable_video_x11_vm=yes)
            if test x$enable_video_x11_vm = xyes; then
                definitely_enable_video_x11_vm=no
                AC_CHECK_HEADER(X11/extensions/xf86vmode.h,
                                have_vm_h_hdr=yes,
                                have_vm_h_hdr=no,
                                [#include <X11/Xlib.h>
                                ])
                if test x$have_vm_h_hdr = xyes; then
                    if test x$enable_x11_shared = xyes && test x$xvidmode_lib != x ; then
                        echo "-- dynamic libXxf86vm -> $xvidmode_lib"
                        AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE, "$xvidmode_lib", [ ])
                        definitely_enable_video_x11_vm=yes
                    else
                        AC_CHECK_LIB(Xxf86vm, XF86VidModeQueryVersion, have_vm_lib=yes)
                        if test x$have_vm_lib = xyes ; then
                            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lXxf86vm"
                            definitely_enable_video_x11_vm=yes
                        fi
                    fi
                fi
            fi
            if test x$definitely_enable_video_x11_vm = xyes; then
                AC_DEFINE(SDL_VIDEO_DRIVER_X11_XVIDMODE, 1, [ ])
                SUMMARY_video_x11="${SUMMARY_video_x11} xvidmode"
            fi
        fi
    fi
}

dnl Set up the Vivante video driver if enabled
CheckVivanteVideo()
{
    AC_ARG_ENABLE(video-vivante,
AC_HELP_STRING([--enable-video-vivante], [use Vivante EGL video driver [[default=yes]]]),
                  , enable_video_vivante=yes)
    if test x$enable_video = xyes -a x$enable_video_vivante = xyes; then
        AC_MSG_CHECKING(for Vivante VDK API)
        have_vivante_vdk=no
        AC_TRY_COMPILE([
          #define LINUX
          #define EGL_API_FB
          #include <gc_vdk.h>
        ],[
        ],[
        have_vivante_vdk=yes
        ])
        AC_MSG_RESULT($have_vivante_vdk)

        AC_MSG_CHECKING(for Vivante FB API)
        have_vivante_egl=no
        AC_TRY_COMPILE([
          #define LINUX
          #define EGL_API_FB
          #include <EGL/eglvivante.h>
        ],[
        ],[
        have_vivante_egl=yes
        ])
        AC_MSG_RESULT($have_vivante_egl)

        if test x$have_vivante_vdk = xyes -o x$have_vivante_egl = xyes; then
            AC_DEFINE(SDL_VIDEO_DRIVER_VIVANTE, 1, [ ])
            EXTRA_CFLAGS="$EXTRA_CFLAGS -DLINUX -DEGL_API_FB"
            if test x$have_vivante_vdk = xyes; then
                AC_DEFINE(SDL_VIDEO_DRIVER_VIVANTE_VDK, 1, [ ])
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lVDK"
            fi
            SOURCES="$SOURCES $srcdir/src/video/vivante/*.c"
            SUMMARY_video="${SUMMARY_video} vivante"
            have_video=yes
        fi
    fi
}

dnl Set up the Haiku video driver if enabled
CheckHaikuVideo()
{
    if test x$enable_video = xyes; then
        AC_DEFINE(SDL_VIDEO_DRIVER_HAIKU, 1, [ ])
        SOURCES="$SOURCES $srcdir/src/video/haiku/*.cc"
        have_video=yes
        SUMMARY_video="${SUMMARY_video} haiku"
    fi
}

dnl Set up the Cocoa video driver for Mac OS X (but not Darwin)
CheckCOCOA()
{
    AC_ARG_ENABLE(video-cocoa,
AC_HELP_STRING([--enable-video-cocoa], [use Cocoa video driver [[default=yes]]]),
                  , enable_video_cocoa=yes)
    if test x$enable_video = xyes -a x$enable_video_cocoa = xyes; then
        save_CFLAGS="$CFLAGS"
        dnl work around that we don't have Objective-C support in autoconf
        CFLAGS="$CFLAGS -x objective-c"
        AC_MSG_CHECKING(for Cocoa framework)
        have_cocoa=no
        AC_TRY_COMPILE([
          #import <Cocoa/Cocoa.h>
        ],[
        ],[
        have_cocoa=yes
        ])
        AC_MSG_RESULT($have_cocoa)
        CFLAGS="$save_CFLAGS"
        if test x$have_cocoa = xyes; then
            AC_DEFINE(SDL_VIDEO_DRIVER_COCOA, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/video/cocoa/*.m"
            SUMMARY_video="${SUMMARY_video} cocoa"
            have_video=yes
        fi
    fi
}

dnl Find DirectFB
CheckDirectFB()
{
    AC_ARG_ENABLE(video-directfb,
AC_HELP_STRING([--enable-video-directfb], [use DirectFB video driver [[default=no]]]),
                  , enable_video_directfb=no)
    if test x$enable_video = xyes -a x$enable_video_directfb = xyes; then
        video_directfb=no

        DIRECTFB_REQUIRED_VERSION=1.0.0
        AC_PATH_PROGS(DIRECTFBCONFIG, directfb-config, no, [$prefix/bin:$PATH])
        if test x$DIRECTFBCONFIG = xno; then
            AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
            if test x$PKG_CONFIG != xno; then
                if $PKG_CONFIG --atleast-pkgconfig-version 0.7 && $PKG_CONFIG --atleast-version $DIRECTFB_REQUIRED_VERSION directfb; then
                    DIRECTFB_CFLAGS=`$PKG_CONFIG --cflags directfb`
                    DIRECTFB_LIBS=`$PKG_CONFIG --libs directfb`
                    DIRECTFB_PREFIX=`$PKG_CONFIG --variable=prefix directfb`
                    video_directfb=yes
                fi
            fi
        else
            set -- `echo $DIRECTFB_REQUIRED_VERSION | sed 's/\./ /g'`
            NEED_VERSION=`expr $1 \* 10000 + $2 \* 100 + $3`
            set -- `$DIRECTFBCONFIG --version | sed 's/\./ /g'`
            HAVE_VERSION=`expr $1 \* 10000 + $2 \* 100 + $3`
            if test $HAVE_VERSION -ge $NEED_VERSION; then
                DIRECTFB_CFLAGS=`$DIRECTFBCONFIG --cflags`
                DIRECTFB_LIBS=`$DIRECTFBCONFIG --libs`
                DIRECTFB_PREFIX=`$DIRECTFBCONFIG --prefix`
                video_directfb=yes
            fi
        fi
        if test x$video_directfb = xyes; then
            # SuSE 11.1 installs directfb-config without directfb-devel
            save_CPPFLAGS="$CPPFLAGS"
            CPPFLAGS="$CPPFLAGS $DIRECTFB_CFLAGS"
            AC_CHECK_HEADER(directfb.h, have_directfb_hdr=yes, have_directfb_hdr=no)
            CPPFLAGS="$save_CPPFLAGS"
            video_directfb=$have_directfb_hdr
        fi
        AC_MSG_CHECKING(for DirectFB $DIRECTFB_REQUIRED_VERSION support)
        AC_MSG_RESULT($video_directfb)

        if test x$video_directfb = xyes; then
            AC_ARG_ENABLE(directfb-shared,
AC_HELP_STRING([--enable-directfb-shared], [dynamically load directfb support [[default=yes]]]),
                              , enable_directfb_shared=yes)

            AC_DEFINE(SDL_VIDEO_DRIVER_DIRECTFB, 1, [ ])
            AC_DEFINE(SDL_VIDEO_RENDER_DIRECTFB, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/video/directfb/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $DIRECTFB_CFLAGS"

            AC_MSG_CHECKING(for directfb dynamic loading support)
            directfb_shared=no
            directfb_lib=[`find_lib "libdirectfb.so.*" "$DIRECTFB_LIBS"`]
            # | sed 's/.*\/\(.*\)/\1/; q'`]
AC_MSG_WARN("directfb $directfb_lib")
            if test x$have_loadso != xyes && \
               test x$enable_directfb_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic directfb loading])
            fi
            if test x$have_loadso = xyes && \
               test x$enable_directfb_shared = xyes && test x$directfb_lib != x; then
                directfb_shared=yes
                echo "-- $directfb_lib_spec -> $directfb_lib"
                AC_DEFINE_UNQUOTED(SDL_VIDEO_DRIVER_DIRECTFB_DYNAMIC, "$directfb_lib", [ ])
                SUMMARY_video="${SUMMARY_video} directfb(dynamic)"
            else
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $DIRECTFB_LIBS"
                SUMMARY_video="${SUMMARY_video} directfb"
            fi
            AC_MSG_RESULT($directfb_shared)
            SDL_CFLAGS="$SDL_CFLAGS $DIRECTFB_CFLAGS"
            have_video=yes
        fi
    fi
}

dnl Find FusionSound
CheckFusionSound()
{
    AC_ARG_ENABLE(fusionsound,
AC_HELP_STRING([--enable-fusionsound], [use FusionSound audio driver [[default=no]]]),
                  , enable_fusionsound=no)
    if test x$enable_audio = xyes -a x$enable_fusionsound = xyes; then
        fusionsound=no

        FUSIONSOUND_REQUIRED_VERSION=1.1.1

        AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
        AC_MSG_CHECKING(for FusionSound $FUSIONSOUND_REQUIRED_VERSION support)
        if test x$PKG_CONFIG != xno; then
            if $PKG_CONFIG --atleast-pkgconfig-version 0.7 && $PKG_CONFIG --atleast-version $FUSIONSOUND_REQUIRED_VERSION fusionsound; then
                FUSIONSOUND_CFLAGS=`$PKG_CONFIG --cflags fusionsound`
                FUSIONSOUND_LIBS=`$PKG_CONFIG --libs fusionsound`
                fusionsound=yes
            fi
        fi
        AC_MSG_RESULT($fusionsound)

        if test x$fusionsound = xyes; then
            AC_DEFINE(SDL_AUDIO_DRIVER_FUSIONSOUND, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/fusionsound/*.c"
            EXTRA_CFLAGS="$EXTRA_CFLAGS $FUSIONSOUND_CFLAGS"
            
            AC_ARG_ENABLE(fusionsound-shared,
AC_HELP_STRING([--enable-fusionsound-shared], [dynamically load fusionsound audio support [[default=yes]]]),
                          , enable_fusionsound_shared=yes)
            fusionsound_shared=no
            AC_MSG_CHECKING(for FusionSound dynamic loading support)
            if test x$have_loadso != xyes && \
               test x$enable_fusionsound_shared = xyes; then
                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic fusionsound loading])
            fi
            if test x$have_loadso = xyes && \
               test x$enable_fusionsound_shared = xyes; then
                AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC, "libfusionsound.so", [ ])
                fusionsound_shared=yes
                SUMMARY_audio="${SUMMARY_audio} fusionsound(dynamic)"
            else
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $FUSIONSOUND_LIBS"
                SUMMARY_audio="${SUMMARY_audio} fusionsound"
            fi
            AC_MSG_RESULT($fusionsound_shared)
            
            have_audio=yes
        fi
    fi
}

dnl rcg04172001 Set up the Null video driver.
CheckDummyVideo()
{
    AC_ARG_ENABLE(video-dummy,
AC_HELP_STRING([--enable-video-dummy], [use dummy video driver [[default=yes]]]),
                  , enable_video_dummy=yes)
    if test x$enable_video_dummy = xyes; then
        AC_DEFINE(SDL_VIDEO_DRIVER_DUMMY, 1, [ ])
        SOURCES="$SOURCES $srcdir/src/video/dummy/*.c"
        have_video=yes
        SUMMARY_video="${SUMMARY_video} dummy"
    fi
}

dnl Check to see if OpenGL support is desired
AC_ARG_ENABLE(video-opengl,
AC_HELP_STRING([--enable-video-opengl], [include OpenGL support [[default=yes]]]),
              , enable_video_opengl=yes)

dnl Find OpenGL
CheckOpenGLX11()
{
    if test x$enable_video = xyes -a x$enable_video_opengl = xyes; then
        AC_MSG_CHECKING(for OpenGL (GLX) support)
        video_opengl=no
        AC_TRY_COMPILE([
         #include <GL/gl.h>
         #include <GL/glx.h>
        ],[
        ],[
        video_opengl=yes
        ])
        AC_MSG_RESULT($video_opengl)
        if test x$video_opengl = xyes; then
            AC_DEFINE(SDL_VIDEO_OPENGL, 1, [ ])
            AC_DEFINE(SDL_VIDEO_OPENGL_GLX, 1, [ ])
            AC_DEFINE(SDL_VIDEO_RENDER_OGL, 1, [ ])
            SUMMARY_video="${SUMMARY_video} opengl"
        fi
    fi
}

dnl Check to see if OpenGL ES support is desired
AC_ARG_ENABLE(video-opengles,
AC_HELP_STRING([--enable-video-opengles], [include OpenGL ES support [[default=yes]]]),
              , enable_video_opengles=yes)
AC_ARG_ENABLE(video-opengles1,
AC_HELP_STRING([--enable-video-opengles1], [include OpenGL ES 1.1 support [[default=yes]]]),
              , enable_video_opengles1=yes)
AC_ARG_ENABLE(video-opengles2,
AC_HELP_STRING([--enable-video-opengles2], [include OpenGL ES 2.0 support [[default=yes]]]),
              , enable_video_opengles2=yes)

dnl Find OpenGL ES
CheckOpenGLESX11()
{
    if test x$enable_video = xyes -a x$enable_video_opengles = xyes; then
        AC_MSG_CHECKING(for EGL support)
        video_opengl_egl=no
        AC_TRY_COMPILE([
          #define LINUX
          #define EGL_API_FB
          #include <EGL/egl.h>
          #include <EGL/eglext.h>
        ],[
        ],[
        video_opengl_egl=yes
        ])
        AC_MSG_RESULT($video_opengl_egl)
        if test x$video_opengl_egl = xyes; then
            AC_DEFINE(SDL_VIDEO_OPENGL_EGL, 1, [ ])
        fi
            
        if test x$enable_video_opengles1 = xyes; then
            AC_MSG_CHECKING(for OpenGL ES v1 headers)
            video_opengles_v1=no
            AC_TRY_COMPILE([
             #include <GLES/gl.h>
             #include <GLES/glext.h>
            ],[
            ],[
            video_opengles_v1=yes
            ])
            AC_MSG_RESULT($video_opengles_v1)
            if test x$video_opengles_v1 = xyes; then
                AC_DEFINE(SDL_VIDEO_OPENGL_ES, 1, [ ])
                AC_DEFINE(SDL_VIDEO_RENDER_OGL_ES, 1, [ ])
                SUMMARY_video="${SUMMARY_video} opengl_es1"
            fi
        fi
        
        if test x$enable_video_opengles2 = xyes; then
            AC_MSG_CHECKING(for OpenGL ES v2 headers)
            video_opengles_v2=no
            AC_TRY_COMPILE([
             #include <GLES2/gl2.h>
             #include <GLES2/gl2ext.h>
            ],[
            ],[
            video_opengles_v2=yes
            ])
            AC_MSG_RESULT($video_opengles_v2)
            if test x$video_opengles_v2 = xyes; then
                AC_DEFINE(SDL_VIDEO_OPENGL_ES2, 1, [ ])
                AC_DEFINE(SDL_VIDEO_RENDER_OGL_ES2, 1, [ ])
                SUMMARY_video="${SUMMARY_video} opengl_es2"
            fi
        fi
    fi
}

dnl Check for Windows OpenGL
CheckWINDOWSGL()
{
    if test x$enable_video = xyes -a x$enable_video_opengl = xyes; then
        AC_DEFINE(SDL_VIDEO_OPENGL, 1, [ ])
        AC_DEFINE(SDL_VIDEO_OPENGL_WGL, 1, [ ])
        AC_DEFINE(SDL_VIDEO_RENDER_OGL, 1, [ ])
        SUMMARY_video="${SUMMARY_video} opengl"
    fi
}

dnl Check for Windows OpenGL
CheckWINDOWSGLES()
{
    if test x$enable_video = xyes -a x$enable_video_opengles = xyes; then

        AC_MSG_CHECKING(for EGL support)
        video_opengl_egl=no
        AC_TRY_COMPILE([
         #include <EGL/egl.h>
        ],[
        ],[
        video_opengl_egl=yes
        ])
        AC_MSG_RESULT($video_opengl_egl)
        if test x$video_opengl_egl = xyes; then
            AC_DEFINE(SDL_VIDEO_OPENGL, 1, [ ])
            AC_DEFINE(SDL_VIDEO_OPENGL_EGL, 1, [ ])
            SUMMARY_video="${SUMMARY_video} opengl_es1"
        fi
       
        AC_MSG_CHECKING(for OpenGL ES v2 headers)
        video_opengles_v2=no
        AC_TRY_COMPILE([
         #include <GLES2/gl2.h>
         #include <GLES2/gl2ext.h>
        ],[
        ],[
        video_opengles_v2=yes
        ])
        AC_MSG_RESULT($video_opengles_v2)
        if test x$video_opengles_v2 = xyes; then
            AC_DEFINE(SDL_VIDEO_OPENGL, 1, [ ])
            AC_DEFINE(SDL_VIDEO_OPENGL_ES2, 1, [ ])
            AC_DEFINE(SDL_VIDEO_RENDER_OGL_ES2, 1, [ ])
            SUMMARY_video="${SUMMARY_video} opengl_es2"
        fi
    fi
}

dnl Check for Haiku OpenGL
CheckHaikuGL()
{
    if test x$enable_video = xyes -a x$enable_video_opengl = xyes; then
        AC_DEFINE(SDL_VIDEO_OPENGL, 1, [ ])
        AC_DEFINE(SDL_VIDEO_OPENGL_HAIKU, 1, [ ])
        AC_DEFINE(SDL_VIDEO_RENDER_OGL, 1, [ ])
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lGL"
        SUMMARY_video="${SUMMARY_video} opengl"
    fi
}

dnl Check for MacOS OpenGL
CheckMacGL()
{
    if test x$enable_video = xyes -a x$enable_video_opengl = xyes; then
        AC_DEFINE(SDL_VIDEO_OPENGL, 1, [ ])
        AC_DEFINE(SDL_VIDEO_OPENGL_CGL, 1, [ ])
        AC_DEFINE(SDL_VIDEO_RENDER_OGL, 1, [ ])
        SUMMARY_video="${SUMMARY_video} opengl"
    fi
}

CheckEmscriptenGLES()
{
    if test x$enable_video = xyes -a x$enable_video_opengles = xyes; then
        AC_MSG_CHECKING(for EGL support)
        video_opengl_egl=no
        AC_TRY_COMPILE([
         #include <EGL/egl.h>
        ],[
        ],[
        video_opengl_egl=yes
        ])
        AC_MSG_RESULT($video_opengl_egl)
        if test x$video_opengl_egl = xyes; then
            AC_DEFINE(SDL_VIDEO_OPENGL_EGL, 1, [ ])
        fi

        AC_MSG_CHECKING(for OpenGL ES v2 headers)
        video_opengles_v2=no
        AC_TRY_COMPILE([
         #include <GLES2/gl2.h>
         #include <GLES2/gl2ext.h>
        ],[
        ],[
        video_opengles_v2=yes
        ])
        AC_MSG_RESULT($video_opengles_v2)
        if test x$video_opengles_v2 = xyes; then
            AC_DEFINE(SDL_VIDEO_OPENGL_ES2, 1, [ ])
            AC_DEFINE(SDL_VIDEO_RENDER_OGL_ES2, 1, [ ])
            SUMMARY_video="${SUMMARY_video} opengl_es2"
        fi
    fi
}

dnl See if we can use the new unified event interface in Linux 2.4
CheckInputEvents()
{
    dnl Check for Linux 2.4 unified input event interface support
        AC_MSG_CHECKING(for Linux 2.4 unified input interface)
        use_input_events=no
        AC_TRY_COMPILE([
          #include <linux/input.h>
        ],[
          #ifndef EVIOCGNAME
          #error EVIOCGNAME() ioctl not available
          #endif
        ],[
        use_input_events=yes
        ])
        AC_MSG_RESULT($use_input_events)
        if test x$use_input_events = xyes; then
            AC_DEFINE(SDL_INPUT_LINUXEV, 1, [ ])
            SUMMARY_input="${SUMMARY_input} linuxev"
        fi
}

dnl See if we can use the kernel kd.h header
CheckInputKD()
{

    AC_MSG_CHECKING(for Linux kd.h)
    use_input_kd=no
    AC_TRY_COMPILE([
      #include <linux/kd.h>
      #include <linux/keyboard.h>
    ],[
        struct kbentry kbe;
        kbe.kb_table = KG_CTRL;
        ioctl(0, KDGKBENT, &kbe);
    ],[
    use_input_kd=yes
    ])
    AC_MSG_RESULT($use_input_kd)
    if test x$use_input_kd = xyes; then
        AC_DEFINE(SDL_INPUT_LINUXKD, 1, [ ])
        SUMMARY_input="${SUMMARY_input} linuxkd"
    fi
}

dnl See if the platform offers libudev for device enumeration and hotplugging.
CheckLibUDev()
{
    AC_ARG_ENABLE(libudev,
AC_HELP_STRING([--enable-libudev], [enable libudev support [[default=yes]]]),
                        , enable_libudev=yes)
    if test x$enable_libudev = xyes; then
        AC_CHECK_HEADER(libudev.h,
                        have_libudev_h_hdr=yes,
                        have_libudev_h_hdr=no)
        if test x$have_libudev_h_hdr = xyes; then
            AC_DEFINE(HAVE_LIBUDEV_H, 1, [ ])
        fi
    fi
}

dnl See if the platform offers libdbus for various IPC techniques.
CheckDBus()
{
    AC_ARG_ENABLE(dbus,
AC_HELP_STRING([--enable-dbus], [enable D-Bus support [[default=yes]]]),
                        , enable_dbus=yes)
    if test x$enable_dbus = xyes; then
        AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
        if test x$PKG_CONFIG != xno; then
            DBUS_CFLAGS=`$PKG_CONFIG --cflags dbus-1`
            save_CFLAGS="$CFLAGS"
            CFLAGS="$save_CFLAGS $DBUS_CFLAGS"
            AC_CHECK_HEADER(dbus/dbus.h,
                            have_dbus_dbus_h_hdr=yes,
                            have_dbus_dbus_h_hdr=no)
            CFLAGS="$save_CFLAGS"
            if test x$have_dbus_dbus_h_hdr = xyes; then
                AC_DEFINE(HAVE_DBUS_DBUS_H, 1, [ ])
                EXTRA_CFLAGS="$EXTRA_CFLAGS $DBUS_CFLAGS"
                SOURCES="$SOURCES $srcdir/src/core/linux/SDL_dbus.c"
            fi
        fi
    fi
}

dnl See if the platform has libibus IME support.
CheckIBus()
{
    AC_ARG_ENABLE(ibus,
AC_HELP_STRING([--enable-ibus], [enable IBus support [[default=yes]]]),
                  , enable_ibus=yes)
    if test x$enable_ibus = xyes; then
        AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
        if test x$PKG_CONFIG != xno; then
            IBUS_CFLAGS=`$PKG_CONFIG --cflags ibus-1.0`
            save_CFLAGS="$CFLAGS"
            CFLAGS="$save_CFLAGS $IBUS_CFLAGS"
            AC_CHECK_HEADER(ibus-1.0/ibus.h,
                            have_ibus_ibus_h_hdr=yes,
                            have_ibus_ibus_h_hdr=no)
            AC_CHECK_HEADER(sys/inotify.h,
                            have_inotify_inotify_h_hdr=yes,
                            have_inotify_inotify_h_hdr=no)
            CFLAGS="$save_CFLAGS"
            if test x$have_ibus_ibus_h_hdr = xyes; then
                if test x$enable_dbus != xyes; then
                    AC_MSG_WARN([DBus support is required for IBus.])
                    have_ibus_ibus_h_hdr=no
                elif test x$have_inotify_inotify_h_hdr != xyes; then
                    AC_MSG_WARN([INotify support is required for IBus.])
                    have_ibus_ibus_h_hdr=no
                else
                    AC_DEFINE(HAVE_IBUS_IBUS_H, 1, [ ])
                    EXTRA_CFLAGS="$EXTRA_CFLAGS $IBUS_CFLAGS"
                    SOURCES="$SOURCES $srcdir/src/core/linux/SDL_ibus.c"
               fi
            fi
        fi
    fi
}

dnl See if we can use the Touchscreen input library
CheckTslib()
{
    AC_ARG_ENABLE(input-tslib,
AC_HELP_STRING([--enable-input-tslib], [use the Touchscreen library for input [[default=yes]]]),
                  , enable_input_tslib=yes)
    if test x$enable_input_tslib = xyes; then
        AC_MSG_CHECKING(for Touchscreen library support)
        enable_input_tslib=no
        AC_TRY_COMPILE([
          #include "tslib.h"
        ],[
        ],[
        enable_input_tslib=yes
        ])
        AC_MSG_RESULT($enable_input_tslib)
        if test x$enable_input_tslib = xyes; then
            AC_DEFINE(SDL_INPUT_TSLIB, 1, [ ])
            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lts"
            SUMMARY_input="${SUMMARY_input} ts"
        fi
    fi
}

dnl See what type of thread model to use on Linux and Solaris
CheckPTHREAD()
{
    dnl Check for pthread support
    AC_ARG_ENABLE(pthreads,
AC_HELP_STRING([--enable-pthreads], [use POSIX threads for multi-threading [[default=yes]]]),
                  , enable_pthreads=yes)
    dnl This is used on Linux for glibc binary compatibility (Doh!)
    AC_ARG_ENABLE(pthread-sem,
AC_HELP_STRING([--enable-pthread-sem], [use pthread semaphores [[default=yes]]]),
                  , enable_pthread_sem=yes)
    case "$host" in
         *-*-androideabi*)
            pthread_cflags="-D_REENTRANT -D_THREAD_SAFE"
            pthread_lib=""
            ;;
        *-*-linux*|*-*-uclinux*)
            pthread_cflags="-D_REENTRANT"
            pthread_lib="-lpthread"
            ;;
        *-*-bsdi*)
            pthread_cflags="-D_REENTRANT -D_THREAD_SAFE"
            pthread_lib=""
            ;;
        *-*-darwin*)
            pthread_cflags="-D_THREAD_SAFE"
# causes Carbon.p complaints?
#            pthread_cflags="-D_REENTRANT -D_THREAD_SAFE"
            ;;
        *-*-freebsd*|*-*-dragonfly*)
            pthread_cflags="-D_REENTRANT -D_THREAD_SAFE"
            pthread_lib="-pthread"
            ;;
        *-*-netbsd*)
            pthread_cflags="-D_REENTRANT -D_THREAD_SAFE"
            pthread_lib="-lpthread"
            ;;
        *-*-openbsd*)
            pthread_cflags="-D_REENTRANT"
            pthread_lib="-pthread"
            ;;
        *-*-solaris2.9)
            # From Solaris 9+, posix4's preferred name is rt.
            pthread_cflags="-D_REENTRANT"
            pthread_lib="-lpthread -lrt"
            ;;
        *-*-solaris2.10)
            # Solaris 10+ merged pthread into libc.
            pthread_cflags="-D_REENTRANT"
            pthread_lib="-lrt"
            ;;
        *-*-solaris*)
            # Solaris 11+ merged rt into libc.
            pthread_cflags="-D_REENTRANT"
            pthread_lib=""
            ;;
        *-*-sysv5*)
            pthread_cflags="-D_REENTRANT -Kthread"
            pthread_lib=""
            ;;
        *-*-aix*)
            pthread_cflags="-D_REENTRANT -mthreads"
            pthread_lib="-lpthread"
            ;;
        *-*-hpux11*)
            pthread_cflags="-D_REENTRANT"
            pthread_lib="-L/usr/lib -lpthread"
            ;;
        *-*-haiku*)
            pthread_cflags="-D_REENTRANT"
            pthread_lib=""
            ;;
        *)
            pthread_cflags="-D_REENTRANT"
            pthread_lib="-lpthread"
            ;;
    esac
    if test x$enable_threads = xyes -a x$enable_pthreads = xyes; then
        # Save the original compiler flags and libraries
        ac_save_cflags="$CFLAGS"; ac_save_libs="$LIBS"
        # Add the pthread compiler flags and libraries
        CFLAGS="$CFLAGS $pthread_cflags"; LIBS="$LIBS $pthread_lib"
        # Check to see if we have pthread support on this system
        AC_MSG_CHECKING(for pthreads)
        use_pthreads=no
        AC_TRY_LINK([
         #include <pthread.h>
        ],[
         pthread_attr_t type;
         pthread_attr_init(&type);
        ],[
        use_pthreads=yes
        ])
        AC_MSG_RESULT($use_pthreads)
        # Restore the compiler flags and libraries
        CFLAGS="$ac_save_cflags"; LIBS="$ac_save_libs"

        # Do futher testing if we have pthread support...
        if test x$use_pthreads = xyes; then
            AC_DEFINE(SDL_THREAD_PTHREAD, 1, [ ])
            EXTRA_CFLAGS="$EXTRA_CFLAGS $pthread_cflags"
            EXTRA_LDFLAGS="$EXTRA_LDFLAGS $pthread_lib"
            SDL_CFLAGS="$SDL_CFLAGS $pthread_cflags"

            # Save the original compiler flags and libraries
            ac_save_cflags="$CFLAGS"; ac_save_libs="$LIBS"
            # Add the pthread compiler flags and libraries
            CFLAGS="$CFLAGS $pthread_cflags"; LIBS="$LIBS $pthread_lib"

            # Check to see if recursive mutexes are available
            AC_MSG_CHECKING(for recursive mutexes)
            has_recursive_mutexes=no
            if test x$has_recursive_mutexes = xno; then
                AC_TRY_LINK([
                  #define _GNU_SOURCE 1
                  #include <pthread.h>
                ],[
                  pthread_mutexattr_t attr;
                  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
                ],[
                has_recursive_mutexes=yes
                AC_DEFINE(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX, 1, [ ])
                ])
            fi
            if test x$has_recursive_mutexes = xno; then
                AC_TRY_LINK([
                  #define _GNU_SOURCE 1
                  #include <pthread.h>
                ],[
                  pthread_mutexattr_t attr;
                  pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
                ],[
                has_recursive_mutexes=yes
                AC_DEFINE(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP, 1, [ ])
                ])
            fi
            AC_MSG_RESULT($has_recursive_mutexes)

            # Check to see if pthread semaphore support is missing
            if test x$enable_pthread_sem = xyes; then
                AC_MSG_CHECKING(for pthread semaphores)
                have_pthread_sem=no
                AC_TRY_COMPILE([
                  #include <pthread.h>
                  #include <semaphore.h>
                ],[
                ],[
                have_pthread_sem=yes
                ])
                AC_MSG_RESULT($have_pthread_sem)
            fi
            if test x$have_pthread_sem = xyes; then
                AC_MSG_CHECKING(for sem_timedwait)
                have_sem_timedwait=no
                AC_TRY_LINK([
                  #include <pthread.h>
                  #include <semaphore.h>
                ],[
                  sem_timedwait(NULL, NULL);
                ],[
                have_sem_timedwait=yes
                AC_DEFINE(HAVE_SEM_TIMEDWAIT)
                ])
                AC_MSG_RESULT($have_sem_timedwait)
            fi

            AC_CHECK_HEADER(pthread_np.h, have_pthread_np_h=yes, have_pthread_np_h=no, [ #include <pthread.h> ])
            if test x$have_pthread_np_h = xyes; then
                AC_DEFINE(HAVE_PTHREAD_NP_H, 1, [ ])
            fi

            # Check to see if pthread naming is available
            AC_MSG_CHECKING(for pthread_setname_np)
            AC_TRY_LINK_FUNC(pthread_setname_np, [
              has_pthread_setname_np=yes
              AC_DEFINE(HAVE_PTHREAD_SETNAME_NP, 1, [ ])
            ],[
              has_pthread_setname_np=no
            ])
            AC_MSG_RESULT($has_pthread_setname_np)

            AC_MSG_CHECKING(for pthread_set_name_np)
            AC_TRY_LINK_FUNC(pthread_set_name_np, [
              has_pthread_set_name_np=yes
              AC_DEFINE(HAVE_PTHREAD_SET_NAME_NP, 1, [ ])
            ],[
              has_pthread_set_name_np=no
            ])
            AC_MSG_RESULT($has_pthread_set_name_np)

            # Restore the compiler flags and libraries
            CFLAGS="$ac_save_cflags"; LIBS="$ac_save_libs"

            # Basic thread creation functions
            SOURCES="$SOURCES $srcdir/src/thread/pthread/SDL_systhread.c"

            # Semaphores
            # We can fake these with mutexes and condition variables if necessary
            if test x$have_pthread_sem = xyes; then
                SOURCES="$SOURCES $srcdir/src/thread/pthread/SDL_syssem.c"
            else
                SOURCES="$SOURCES $srcdir/src/thread/generic/SDL_syssem.c"
            fi

            # Mutexes
            # We can fake these with semaphores if necessary
            SOURCES="$SOURCES $srcdir/src/thread/pthread/SDL_sysmutex.c"

            # Condition variables
            # We can fake these with semaphores and mutexes if necessary
            SOURCES="$SOURCES $srcdir/src/thread/pthread/SDL_syscond.c"

            # Thread local storage
            SOURCES="$SOURCES $srcdir/src/thread/pthread/SDL_systls.c"

            have_threads=yes
        fi
    fi
}

dnl Determine whether the compiler can produce Windows executables
CheckWINDOWS()
{
    AC_MSG_CHECKING(Windows compiler)
    have_win32_gcc=no
    AC_TRY_COMPILE([
     #include <windows.h>
    ],[
    ],[
    have_win32_gcc=yes
    ])
    AC_MSG_RESULT($have_win32_gcc)
    if test x$have_win32_gcc != xyes; then
       AC_MSG_ERROR([
*** Your compiler ($CC) does not produce Windows executables!
       ])
    fi

    AC_MSG_CHECKING(Windows CE)
    have_wince=no
    AC_TRY_COMPILE([
#if !defined(_WIN32_WCE) && !defined(__MINGW32CE__)
#error This is not Windows CE
#endif
    ],[
    ],[
    have_wince=yes
       AC_MSG_ERROR([
*** Sorry, Windows CE is no longer supported.
       ])
    ])
    AC_MSG_RESULT($have_wince)

    # This fixes Windows stack alignment with newer GCC
    CheckStackBoundary
}

dnl Find the DirectX includes and libraries
CheckDIRECTX()
{
    AC_ARG_ENABLE(directx,
AC_HELP_STRING([--enable-directx], [use DirectX for Windows audio/video [[default=yes]]]),
                  , enable_directx=yes)
    if test x$enable_directx = xyes; then
        AC_CHECK_HEADER(d3d9.h, have_d3d=yes)
        AC_CHECK_HEADER(d3d11_1.h, have_d3d11=yes)
        AC_CHECK_HEADER(ddraw.h, have_ddraw=yes)
        AC_CHECK_HEADER(dsound.h, have_dsound=yes)
        AC_CHECK_HEADER(dinput.h, have_dinput=yes)
        AC_CHECK_HEADER(dxgi.h, have_dxgi=yes)
        AC_CHECK_HEADER(xaudio2.h, have_xaudio2=yes)
        AC_CHECK_HEADER(xinput.h, have_xinput=yes)

        if test x$have_ddraw = xyes; then
            AC_DEFINE(HAVE_DDRAW_H, 1, [ ])
        fi
        if test x$have_dinput = xyes; then
            AC_DEFINE(HAVE_DINPUT_H, 1, [ ])
        fi
        if test x$have_dsound = xyes; then
            AC_DEFINE(HAVE_DSOUND_H, 1, [ ])
        fi
        if test x$have_dxgi = xyes; then
            AC_DEFINE(HAVE_DXGI_H, 1, [ ])
        fi
        if test x$have_xinput = xyes; then
            AC_DEFINE(HAVE_XINPUT_H, 1, [ ])
        fi

        SUMMARY_video="${SUMMARY_video} directx"
        SUMMARY_audio="${SUMMARY_audio} directx"

        # FIXME: latest Cygwin finds dinput headers, but we die on other win32 headers.
        # FIXME:  ...so force it off for now.
        case "$host" in
            *-*-cygwin*)
            have_dinput=false
            ;;
        esac
    fi
}

dnl Check for the dlfcn.h interface for dynamically loading objects
CheckDLOPEN()
{
    AC_ARG_ENABLE(sdl-dlopen,
AC_HELP_STRING([--enable-sdl-dlopen], [use dlopen for shared object loading [[default=yes]]]),
                  , enable_sdl_dlopen=yes)
    if test x$enable_sdl_dlopen = xyes; then
        AC_MSG_CHECKING(for dlopen)
        have_dlopen=no
        AC_TRY_COMPILE([
         #include <dlfcn.h>
        ],[
         void *handle = dlopen("", RTLD_NOW);
         const char *loaderror = (char *) dlerror();
        ],[
        have_dlopen=yes
        ])
        AC_MSG_RESULT($have_dlopen)

        if test x$have_dlopen = xyes; then
            AC_CHECK_LIB(c, dlopen, EXTRA_LDFLAGS="$EXTRA_LDFLAGS",
               AC_CHECK_LIB(dl, dlopen, EXTRA_LDFLAGS="$EXTRA_LDFLAGS -ldl",
                  AC_CHECK_LIB(ltdl, dlopen, EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lltdl")))
            AC_DEFINE(SDL_LOADSO_DLOPEN, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/loadso/dlopen/*.c"
            have_loadso=yes
        fi
    fi
}

dnl Check for the usbhid(3) library on *BSD
CheckUSBHID()
{
    case "$host" in
        *-*-*bsd*)
            if test x$enable_joystick = xyes; then
                AC_CHECK_LIB(usbhid, hid_init, have_libusbhid=yes)
                if test x$have_libusbhid = xyes; then
                    AC_CHECK_HEADER(usbhid.h, [USB_CFLAGS="-DHAVE_USBHID_H"])
                    AC_CHECK_HEADER(libusbhid.h, [USB_CFLAGS="-DHAVE_LIBUSBHID_H"])
                    USB_LIBS="$USB_LIBS -lusbhid"
                else
                    AC_CHECK_HEADER(usb.h, [USB_CFLAGS="-DHAVE_USB_H"])
                    AC_CHECK_HEADER(libusb.h, [USB_CFLAGS="-DHAVE_LIBUSB_H"])
                    AC_CHECK_LIB(usb, hid_init, [USB_LIBS="$USB_LIBS -lusb"])
                fi
                    
                save_CFLAGS="$CFLAGS"
                CFLAGS="$CFLAGS $USB_CFLAGS"

                AC_MSG_CHECKING(for usbhid)
                have_usbhid=no
                AC_TRY_COMPILE([
                  #include <sys/types.h>
                  #if defined(HAVE_USB_H)
                  #include <usb.h>
                  #endif
                  #ifdef __DragonFly__
                  # include <bus/usb/usb.h>
                  # include <bus/usb/usbhid.h>
                  #else
                  # include <dev/usb/usb.h>
                  # include <dev/usb/usbhid.h>
                  #endif
                  #if defined(HAVE_USBHID_H)
                  #include <usbhid.h>
                  #elif defined(HAVE_LIBUSB_H)
                  #include <libusb.h>
                  #elif defined(HAVE_LIBUSBHID_H)
                  #include <libusbhid.h>
                  #endif
                ],[
                  struct report_desc *repdesc;
                  struct usb_ctl_report *repbuf;
                  hid_kind_t hidkind;
                ],[
                have_usbhid=yes
                ])
                AC_MSG_RESULT($have_usbhid)

                if test x$have_usbhid = xyes; then
                    AC_MSG_CHECKING(for ucr_data member of usb_ctl_report)
                    have_usbhid_ucr_data=no
                    AC_TRY_COMPILE([
                      #include <sys/types.h>
                      #if defined(HAVE_USB_H)
                      #include <usb.h>
                      #endif
                      #ifdef __DragonFly__
                      # include <bus/usb/usb.h>
                      # include <bus/usb/usbhid.h>
                      #else
                      # include <dev/usb/usb.h>
                      # include <dev/usb/usbhid.h>
                      #endif
                      #if defined(HAVE_USBHID_H)
                      #include <usbhid.h>
                      #elif defined(HAVE_LIBUSB_H)
                      #include <libusb.h>
                      #elif defined(HAVE_LIBUSBHID_H)
                      #include <libusbhid.h>
                      #endif
                    ],[
                      struct usb_ctl_report buf;
                      if (buf.ucr_data) { }
                    ],[
                    have_usbhid_ucr_data=yes
                    ])
                    if test x$have_usbhid_ucr_data = xyes; then
                        USB_CFLAGS="$USB_CFLAGS -DUSBHID_UCR_DATA"
                    fi
                    AC_MSG_RESULT($have_usbhid_ucr_data)
                    
                    AC_MSG_CHECKING(for new usbhid API)
                    have_usbhid_new=no
                    AC_TRY_COMPILE([
                      #include <sys/types.h>
                      #if defined(HAVE_USB_H)
                      #include <usb.h>
                      #endif
                      #ifdef __DragonFly__
                      #include <bus/usb/usb.h>
                      #include <bus/usb/usbhid.h>
                      #else
                      #include <dev/usb/usb.h>
                      #include <dev/usb/usbhid.h>
                      #endif
                      #if defined(HAVE_USBHID_H)
                      #include <usbhid.h>
                      #elif defined(HAVE_LIBUSB_H)
                      #include <libusb.h>
                      #elif defined(HAVE_LIBUSBHID_H)
                      #include <libusbhid.h>
                      #endif
                    ],[
                      report_desc_t d;
                      hid_start_parse(d, 1, 1);
                    ],[
                    have_usbhid_new=yes
                    ])
                    if test x$have_usbhid_new = xyes; then
                        USB_CFLAGS="$USB_CFLAGS -DUSBHID_NEW"
                    fi
                    AC_MSG_RESULT($have_usbhid_new)

                    AC_MSG_CHECKING(for struct joystick in machine/joystick.h)
                    have_machine_joystick=no
                    AC_TRY_COMPILE([
                      #include <machine/joystick.h>
                    ],[
                      struct joystick t;
                    ],[
                    have_machine_joystick=yes
                    ])
                    if test x$have_machine_joystick = xyes; then
                        AC_DEFINE(SDL_JOYSTICK_USBHID_MACHINE_JOYSTICK_H, 1, [ ])
                    fi
                    AC_MSG_RESULT($have_machine_joystick)

                    AC_DEFINE(SDL_JOYSTICK_USBHID, 1, [ ])
                    SOURCES="$SOURCES $srcdir/src/joystick/bsd/*.c"
                    EXTRA_CFLAGS="$EXTRA_CFLAGS $USB_CFLAGS"
                    EXTRA_LDFLAGS="$EXTRA_LDFLAGS $USB_LIBS"
                    have_joystick=yes
                fi
                CFLAGS="$save_CFLAGS"
            fi
        ;;
    esac
}

dnl Check for clock_gettime()
CheckClockGettime()
{
    AC_ARG_ENABLE(clock_gettime,
AC_HELP_STRING([--enable-clock_gettime], [use clock_gettime() instead of gettimeofday() on UNIX [[default=yes]]]),
                  , enable_clock_gettime=yes)
    if test x$enable_clock_gettime = xyes; then
        AC_CHECK_LIB(rt, clock_gettime, have_clock_gettime=yes)
        if test x$have_clock_gettime = xyes; then
            AC_DEFINE(HAVE_CLOCK_GETTIME, 1, [ ])
            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lrt"
        else
            AC_CHECK_LIB(c, clock_gettime, have_clock_gettime=yes)
            if test x$have_clock_gettime = xyes; then
               AC_DEFINE(HAVE_CLOCK_GETTIME, 1, [ ])
               EXTRA_LDFLAGS="$EXTRA_LDFLAGS"
            fi
        fi
    fi
}

dnl Check for a valid linux/version.h
CheckLinuxVersion()
{
    AC_CHECK_HEADER(linux/version.h, have_linux_version_h=yes)
    if test x$have_linux_version_h = xyes; then
        EXTRA_CFLAGS="$EXTRA_CFLAGS -DHAVE_LINUX_VERSION_H"
    fi
}

dnl Check if we want to use RPATH
CheckRPATH()
{
    AC_ARG_ENABLE(rpath,
AC_HELP_STRING([--enable-rpath], [use an rpath when linking SDL [[default=yes]]]),
                  , enable_rpath=yes)
}

dnl Set up the configuration based on the host platform!
case "$host" in
    *-*-linux*|*-*-uclinux*|*-*-gnu*|*-*-k*bsd*-gnu|*-*-bsdi*|*-*-freebsd*|*-*-dragonfly*|*-*-netbsd*|*-*-openbsd*|*-*-sysv5*|*-*-solaris*|*-*-hpux*|*-*-aix*|*-*-minix*)
        case "$host" in
            *-raspberry-linux*)
                # Raspberry Pi
                ARCH=linux
                RPI_CFLAGS="-I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux"
                CFLAGS="$CFLAGS $RPI_CFLAGS"
                SDL_CFLAGS="$SDL_CFLAGS $RPI_CFLAGS"
                EXTRA_CFLAGS="$EXTRA_CFLAGS $RPI_CFLAGS"
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS -L/opt/vc/lib -lbcm_host -ldl"

                if test x$enable_video = xyes; then
                    SOURCES="$SOURCES $srcdir/src/video/raspberry/*.c"
                    # FIXME: confdefs? Not AC_DEFINE?
                    $as_echo "#define SDL_VIDEO_DRIVER_RPI 1" >>confdefs.h
                    SUMMARY_video="${SUMMARY_video} rpi"
                fi
                ;;
            *-*-androideabi*)
                # Android
                ARCH=android
                ANDROID_CFLAGS="-DGL_GLEXT_PROTOTYPES"
                CFLAGS="$CFLAGS $ANDROID_CFLAGS"
                SDL_CFLAGS="$SDL_CFLAGS $ANDROID_CFLAGS"
                EXTRA_CFLAGS="$EXTRA_CFLAGS $ANDROID_CFLAGS"
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS -ldl -lGLESv1_CM -lGLESv2 -llog -landroid"

                if test x$enable_video = xyes; then
                    SOURCES="$SOURCES $srcdir/src/core/android/*.c $srcdir/src/video/android/*.c"
                    # FIXME: confdefs? Not AC_DEFINE?
                    $as_echo "#define SDL_VIDEO_DRIVER_ANDROID 1" >>confdefs.h
                    SUMMARY_video="${SUMMARY_video} android"
                fi
                ;;
            *-*-linux*)         ARCH=linux ;;
            *-*-uclinux*)       ARCH=linux ;;
            *-*-kfreebsd*-gnu)  ARCH=kfreebsd-gnu ;;
            *-*-knetbsd*-gnu)   ARCH=knetbsd-gnu ;;
            *-*-kopenbsd*-gnu)  ARCH=kopenbsd-gnu ;;
            *-*-gnu*)           ARCH=gnu ;; # must be last of the gnu variants
            *-*-bsdi*)          ARCH=bsdi ;;
            *-*-freebsd*)       ARCH=freebsd ;;
            *-*-dragonfly*)     ARCH=freebsd ;;
            *-raspberry-netbsd*)
                # Raspberry Pi
                ARCH=netbsd
                RPI_CFLAGS="-I/usr/pkg/include -I/usr/pkg/include/interface/vcos/pthreads -I/usr/pkg/include/interface/vmcs_host/linux"
                CFLAGS="$CFLAGS $RPI_CFLAGS"
                SDL_CFLAGS="$SDL_CFLAGS $RPI_CFLAGS"
                EXTRA_CFLAGS="$EXTRA_CFLAGS $RPI_CFLAGS"
                EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-R/usr/pkg/lib -L/usr/pkg/lib -lbcm_host -ldl"

                if test x$enable_video = xyes; then
                    SOURCES="$SOURCES $srcdir/src/video/raspberry/*.c"
                    $as_echo "#define SDL_VIDEO_DRIVER_RPI 1" >>confdefs.h
                    SUMMARY_video="${SUMMARY_video} raspberry"
                fi
                ;;
            *-*-netbsd*)        ARCH=netbsd ;;
            *-*-openbsd*)       ARCH=openbsd ;;
            *-*-sysv5*)         ARCH=sysv5 ;;
            *-*-solaris*)       ARCH=solaris ;;
            *-*-hpux*)          ARCH=hpux ;;
            *-*-aix*)           ARCH=aix ;;
            *-*-minix*)         ARCH=minix ;;
        esac
        CheckVisibilityHidden
        CheckDummyVideo
        CheckDiskAudio
        CheckDummyAudio
        CheckDLOPEN
        CheckOSS
        CheckALSA
        CheckPulseAudio
        CheckARTSC
        CheckESD
        CheckNAS
        CheckSNDIO
        CheckX11
        CheckDirectFB
        CheckFusionSound
        CheckOpenGLX11
        CheckOpenGLESX11
        CheckMir
        CheckWayland
        CheckLibUDev
        CheckDBus
        CheckIBus
        case $ARCH in
          linux)
              CheckInputEvents
              CheckInputKD
          ;;
        esac
        CheckTslib
        CheckUSBHID
        CheckPTHREAD
        CheckClockGettime
        CheckLinuxVersion
        CheckRPATH
        CheckVivanteVideo
        # Set up files for the audio library
        if test x$enable_audio = xyes; then
          case $ARCH in
            sysv5|solaris|hpux)
                AC_DEFINE(SDL_AUDIO_DRIVER_SUNAUDIO, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/audio/sun/*.c"
                have_audio=yes
            ;;
            netbsd)  # Don't use this on OpenBSD, it's busted.
                AC_DEFINE(SDL_AUDIO_DRIVER_BSD, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/audio/bsd/*.c"
                have_audio=yes
            ;;
            aix)
                AC_DEFINE(SDL_AUDIO_DRIVER_PAUDIO, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/audio/paudio/*.c"
                have_audio=yes
            ;;
            android)
                AC_DEFINE(SDL_AUDIO_DRIVER_ANDROID, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/audio/android/*.c"
                SUMMARY_audio="${SUMMARY_audio} android"
                have_audio=yes
            ;;
          esac
        fi
        # Set up files for the joystick library
        if test x$enable_joystick = xyes; then
          case $ARCH in
            linux)
                AC_DEFINE(SDL_JOYSTICK_LINUX, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/joystick/linux/*.c"
                have_joystick=yes
            ;;
            android)
                AC_DEFINE(SDL_JOYSTICK_ANDROID, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/joystick/android/*.c"
                have_joystick=yes
            ;;
          esac
        fi
        # Set up files for the haptic library
        if test x$enable_haptic = xyes; then
           if test x$use_input_events = xyes; then
             case $ARCH in
               linux)
                   AC_DEFINE(SDL_HAPTIC_LINUX, 1, [ ])
                   SOURCES="$SOURCES $srcdir/src/haptic/linux/*.c"
                   have_haptic=yes
               ;;
             esac
           fi
        fi
        # Set up files for the power library
        if test x$enable_power = xyes; then
             case $ARCH in
               linux)
                   AC_DEFINE(SDL_POWER_LINUX, 1, [ ])
                   SOURCES="$SOURCES $srcdir/src/power/linux/*.c"
                   have_power=yes
               ;;
               android)
                   AC_DEFINE(SDL_POWER_ANDROID, 1, [ ])
                   SOURCES="$SOURCES $srcdir/src/power/android/*.c"
                   have_power=yes
               ;;
             esac
        fi
        # Set up files for the filesystem library
        if test x$enable_filesystem = xyes; then
             case $ARCH in
               android)
                   AC_DEFINE(SDL_FILESYSTEM_ANDROID, 1, [ ])
                   SOURCES="$SOURCES $srcdir/src/filesystem/android/*.c"
                   have_filesystem=yes
               ;;
               *)
                   AC_DEFINE(SDL_FILESYSTEM_UNIX, 1, [ ])
                   SOURCES="$SOURCES $srcdir/src/filesystem/unix/*.c"
                   have_filesystem=yes
               ;;
             esac
        fi
        # Set up files for the timer library
        if test x$enable_timers = xyes; then
            AC_DEFINE(SDL_TIMER_UNIX, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/timer/unix/*.c"
            have_timers=yes
        fi
        # Set up files for udev hotplugging support
        if test x$enable_libudev = xyes && test x$have_libudev_h_hdr = xyes; then
            SOURCES="$SOURCES $srcdir/src/core/linux/SDL_udev.c"               
        fi
        # Set up files for evdev input
        if test x$use_input_events = xyes; then
            SOURCES="$SOURCES $srcdir/src/core/linux/SDL_evdev.c"
        fi       
        ;;
    *-*-cygwin* | *-*-mingw32*)
        ARCH=win32
        if test "$build" != "$host"; then # cross-compiling
            # Default cross-compile location
            ac_default_prefix=/usr/local/cross-tools/$host
        else
            # Look for the location of the tools and install there
            if test "$BUILD_PREFIX" != ""; then
                ac_default_prefix=$BUILD_PREFIX
            fi
        fi
        CheckDummyVideo
        CheckDiskAudio
        CheckDummyAudio
        CheckWINDOWS
        CheckWINDOWSGL
        CheckWINDOWSGLES
        CheckDIRECTX

        # Set up the core platform files
        SOURCES="$SOURCES $srcdir/src/core/windows/*.c"

        # Set up files for the video library
        if test x$enable_video = xyes; then
            AC_DEFINE(SDL_VIDEO_DRIVER_WINDOWS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/video/windows/*.c"
            have_video=yes
            AC_ARG_ENABLE(render-d3d,
AC_HELP_STRING([--enable-render-d3d], [enable the Direct3D render driver [[default=yes]]]),
                                , enable_render_d3d=yes)
            if test x$enable_render_d3d = xyes -a x$have_d3d = xyes; then
                AC_DEFINE(SDL_VIDEO_RENDER_D3D, 1, [ ])
            fi
            if test x$enable_render_d3d = xyes -a x$have_d3d11 = xyes; then
                AC_DEFINE(SDL_VIDEO_RENDER_D3D11, 1, [ ])
            fi
        fi
        # Set up files for the audio library
        if test x$enable_audio = xyes; then
            AC_DEFINE(SDL_AUDIO_DRIVER_WINMM, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/winmm/*.c"
            if test x$have_dsound = xyes; then
                AC_DEFINE(SDL_AUDIO_DRIVER_DSOUND, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/audio/directsound/*.c"
            fi
            if test x$have_xaudio2 = xyes; then
                AC_DEFINE(SDL_AUDIO_DRIVER_XAUDIO2, 1, [ ])
                SOURCES="$SOURCES $srcdir/src/audio/xaudio2/*.c"
            fi
            have_audio=yes
        fi
        # Set up files for the joystick library
        if test x$enable_joystick = xyes; then
            if test x$have_dinput = xyes -o x$have_xinput = xyes; then
                if test x$have_xinput = xyes; then
                    AC_DEFINE(SDL_JOYSTICK_XINPUT, 1, [ ])
                fi
                if test x$have_dinput = xyes; then
                    AC_DEFINE(SDL_JOYSTICK_DINPUT, 1, [ ])
                    EXTRA_LDFLAGS="$EXTRA_LDFLAGS -ldinput8 -ldxguid -ldxerr8"
                fi
            else
                AC_DEFINE(SDL_JOYSTICK_WINMM, 1, [ ])
            fi
            SOURCES="$SOURCES $srcdir/src/joystick/windows/*.c"
            have_joystick=yes
        fi
        if test x$enable_haptic = xyes; then
            if test x$have_dinput = xyes -o x$have_xinput = xyes; then
                if test x$have_xinput = xyes; then
                    AC_DEFINE(SDL_HAPTIC_XINPUT, 1, [ ])
                fi
                if test x$have_dinput = xyes; then
                    AC_DEFINE(SDL_HAPTIC_DINPUT, 1, [ ])
                fi
                SOURCES="$SOURCES $srcdir/src/haptic/windows/*.c"
                have_haptic=yes
            fi
        fi
        if test x$enable_power = xyes; then
            AC_DEFINE(SDL_POWER_WINDOWS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/power/windows/SDL_syspower.c"
            have_power=yes
        fi
        if test x$enable_filesystem = xyes; then
            AC_DEFINE(SDL_FILESYSTEM_WINDOWS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/filesystem/windows/SDL_sysfilesystem.c"
            have_filesystem=yes
        fi
        # Set up files for the thread library
        if test x$enable_threads = xyes; then
            AC_DEFINE(SDL_THREAD_WINDOWS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/thread/windows/*.c"
            SOURCES="$SOURCES $srcdir/src/thread/generic/SDL_syscond.c"
            have_threads=yes
        fi
        # Set up files for the timer library
        if test x$enable_timers = xyes; then
            AC_DEFINE(SDL_TIMER_WINDOWS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/timer/windows/*.c"
            have_timers=yes
        fi
        # Set up files for the shared object loading library
        if test x$enable_loadso = xyes; then
            AC_DEFINE(SDL_LOADSO_WINDOWS, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/loadso/windows/*.c"
            have_loadso=yes
        fi
        # Set up the system libraries we need
        if test -f /lib/w32api/libuuid.a; then
            LIBUUID=/lib/w32api/libuuid.a
        else
            LIBUUID=-luuid
        fi
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -luser32 -lgdi32 -lwinmm -limm32 -lole32 -loleaut32 -lshell32 -lversion $LIBUUID -static-libgcc"
        # The Windows platform requires special setup
        VERSION_SOURCES="$srcdir/src/main/windows/*.rc"
        SDLMAIN_SOURCES="$srcdir/src/main/windows/*.c"
        SDL_CFLAGS="$SDL_CFLAGS -Dmain=SDL_main"
        SDL_LIBS="-lSDL2main $SDL_LIBS -mwindows"

        # Check to see if this is a mingw or cygwin build
        have_mingw32=
        AC_CHECK_LIB(mingw32, main, [have_mingw32=yes])
        if test x$have_mingw32 = xyes; then
            SDL_LIBS="-lmingw32 $SDL_LIBS"
        else
            SDL_LIBS="-lcygwin $SDL_LIBS"
        fi
        ;;

    dnl BeOS support removed after SDL 2.0.1. Haiku still works.  --ryan.
    *-*-beos*)
        AC_MSG_ERROR([
*** BeOS support has been removed as of SDL 2.0.2.
        ])
        ;;

    *-*-haiku*)
        ARCH=haiku
        ac_default_prefix=/boot/system
        CheckDummyVideo
        CheckDiskAudio
        CheckDummyAudio
        CheckHaikuVideo
        CheckHaikuGL
        CheckPTHREAD

        # Set up files for the audio library
        if test x$enable_audio = xyes; then
            AC_DEFINE(SDL_AUDIO_DRIVER_HAIKU, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/haiku/*.cc"
            have_audio=yes
        fi
        # Set up files for the joystick library
        if test x$enable_joystick = xyes; then
            AC_DEFINE(SDL_JOYSTICK_HAIKU, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/joystick/haiku/*.cc"
            have_joystick=yes
        fi
        # Set up files for the timer library
        if test x$enable_timers = xyes; then
            AC_DEFINE(SDL_TIMER_HAIKU, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/timer/haiku/*.c"
            have_timers=yes
        fi
        # Set up files for the shared object loading library
        if test x$enable_loadso = xyes; then
            AC_DEFINE(SDL_LOADSO_HAIKU, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/loadso/haiku/*.c"
            have_loadso=yes
        fi
        # Set up files for the system power library
        if test x$enable_power = xyes; then
            AC_DEFINE(SDL_POWER_HAIKU, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/power/haiku/*.c"
            have_power=yes
        fi
        # Set up files for the system filesystem library
        if test x$enable_filesystem = xyes; then
            AC_DEFINE(SDL_FILESYSTEM_HAIKU, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/filesystem/haiku/*.cc"
            have_filesystem=yes
        fi
        # The Haiku platform requires special setup.
        SOURCES="$srcdir/src/main/haiku/*.cc $SOURCES"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lroot -lbe -lmedia -lgame -ldevice -ltextencoding"
        ;;
    arm*-apple-darwin*)
        # iOS - We are not writing anything to confdefs.h because you have to replace
        # SDL_config.h for SDL_config_iphoneos.h anyway
        ARCH=ios

        CheckVisibilityHidden
        CheckDummyVideo
        CheckDiskAudio
        CheckDummyAudio
        CheckDLOPEN
        CheckCOCOA
        CheckPTHREAD


        # Set up files for the audio library
        if test x$enable_audio = xyes; then
            SOURCES="$SOURCES $srcdir/src/audio/coreaudio/*.c"
            SUMMARY_audio="${SUMMARY_audio} coreaudio"
            have_audio=yes
        fi
        # Set up files for the joystick library
        if test x$enable_joystick = xyes; then
            SOURCES="$SOURCES $srcdir/src/joystick/iphoneos/*.m"
            have_joystick=yes
        fi
        # Set up files for the haptic library
        #if test x$enable_haptic = xyes; then
        #    SOURCES="$SOURCES $srcdir/src/haptic/darwin/*.c"
        #    have_haptic=yes
        #    EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,ForceFeedback"
        #fi
        # Set up files for the power library
        if test x$enable_power = xyes; then
            SOURCES="$SOURCES $srcdir/src/power/uikit/*.m"
            have_power=yes
        fi
        # Set up files for the filesystem library
        if test x$enable_filesystem = xyes; then
            SOURCES="$SOURCES $srcdir/src/filesystem/cocoa/*.m"
            have_filesystem=yes
        fi
        # Set up files for the timer library
        if test x$enable_timers = xyes; then
            SOURCES="$SOURCES $srcdir/src/timer/unix/*.c"
            have_timers=yes
        fi
        # Set up additional files for the file library
        if test x$enable_file = xyes; then
            SOURCES="$SOURCES $srcdir/src/file/cocoa/*.m"
        fi
        # The iOS platform requires special setup.
        SOURCES="$SOURCES $srcdir/src/video/uikit/*.m"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -fpascal-strings"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm -liconv -lobjc"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,Foundation"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,UIKit"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,OpenGLES"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,QuartzCore"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,CoreAudio"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,AudioToolbox"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,CoreGraphics"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,CoreMotion"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,GameController"
        ;;
    *-*-darwin* )
        # This could be either full "Mac OS X", or plain "Darwin" which is
        # just the OS X kernel sans upper layers like Carbon and Cocoa.
        # Next line is broken, and a few files below require Mac OS X (full)
        ARCH=macosx

        # Mac OS X builds with both the Carbon and OSX APIs at the moment
        EXTRA_CFLAGS="$EXTRA_CFLAGS -DTARGET_API_MAC_CARBON"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -DTARGET_API_MAC_OSX"

        CheckVisibilityHidden
        CheckDummyVideo
        CheckDiskAudio
        CheckDummyAudio
        CheckDLOPEN
        CheckCOCOA
        CheckX11
        CheckMacGL
        CheckOpenGLX11
        CheckPTHREAD

        # Set up files for the audio library
        if test x$enable_audio = xyes; then
            AC_DEFINE(SDL_AUDIO_DRIVER_COREAUDIO, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/coreaudio/*.c"
            SUMMARY_audio="${SUMMARY_audio} coreaudio"
            have_audio=yes
        fi
        # Set up files for the joystick library
        if test x$enable_joystick = xyes; then
            AC_DEFINE(SDL_JOYSTICK_IOKIT, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/joystick/darwin/*.c"
            have_joystick=yes
        fi
        # Set up files for the haptic library
        if test x$enable_haptic = xyes; then
            AC_DEFINE(SDL_HAPTIC_IOKIT, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/haptic/darwin/*.c"
            have_haptic=yes
            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,ForceFeedback"
        fi
        # Set up files for the power library
        if test x$enable_power = xyes; then
            AC_DEFINE(SDL_POWER_MACOSX, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/power/macosx/*.c"
            have_power=yes
        fi
        # Set up files for the filesystem library
        if test x$enable_filesystem = xyes; then
            AC_DEFINE(SDL_FILESYSTEM_COCOA, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/filesystem/cocoa/*.m"
            have_filesystem=yes
        fi
        # Set up files for the timer library
        if test x$enable_timers = xyes; then
            AC_DEFINE(SDL_TIMER_UNIX, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/timer/unix/*.c"
            have_timers=yes
        fi
        # Set up additional files for the file library
        if test x$enable_file = xyes; then
            SOURCES="$SOURCES $srcdir/src/file/cocoa/*.m"
        fi
        # The Mac OS X platform requires special setup.
        EXTRA_CFLAGS="$EXTRA_CFLAGS -fpascal-strings"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lobjc"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,CoreVideo"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,Cocoa"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,Carbon"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,IOKit"
        # If audio is used, add the AudioUnit framework
        if test x$enable_audio = xyes; then
            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,CoreAudio -Wl,-framework,AudioToolbox -Wl,-framework,AudioUnit"
        fi
        ;;
    *-nacl|*-pnacl)
        ARCH=nacl
        CheckNativeClient
        CheckDummyAudio
        CheckDummyVideo
        CheckInputEvents
        CheckPTHREAD
        
        # Set up files for the timer library
        if test x$enable_timers = xyes; then
            AC_DEFINE(SDL_TIMER_UNIX)
            SOURCES="$SOURCES $srcdir/src/timer/unix/*.c"
            have_timers=yes
        fi
        
        if test x$enable_filesystem = xyes; then
            AC_DEFINE(SDL_FILESYSTEM_NACL, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/filesystem/nacl/*.c"
            have_filesystem=yes
        fi
        ;;
    *-*-emscripten* )
        if test x$enable_video = xyes; then
            AC_DEFINE(SDL_VIDEO_DRIVER_EMSCRIPTEN, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/video/emscripten/*.c"
            have_video=yes
            SUMMARY_video="${SUMMARY_video} emscripten"
        fi

        if test x$enable_audio = xyes; then
            AC_DEFINE(SDL_AUDIO_DRIVER_EMSCRIPTEN, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/audio/emscripten/*.c"
            have_audio=yes
            SUMMARY_audio="${SUMMARY_audio} emscripten"
        fi

        CheckVisibilityHidden
        CheckDummyVideo
        CheckDiskAudio
        CheckDummyAudio
        CheckDLOPEN
        CheckClockGettime
        CheckEmscriptenGLES

         # Set up files for the power library
        if test x$enable_power = xyes; then
            AC_DEFINE(SDL_POWER_EMSCRIPTEN, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/power/emscripten/*.c"
            have_power=yes
        fi
        
        # Set up files for the power library
        if test x$enable_joystick = xyes; then
            AC_DEFINE(SDL_JOYSTICK_EMSCRIPTEN, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/joystick/emscripten/*.c"
            have_joystick=yes
        fi

        # Set up files for the filesystem library
        if test x$enable_filesystem = xyes; then
            AC_DEFINE(SDL_FILESYSTEM_EMSCRIPTEN, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/filesystem/emscripten/*.c"
            have_filesystem=yes
        fi
        # Set up files for the timer library
        if test x$enable_timers = xyes; then
            AC_DEFINE(SDL_TIMER_UNIX, 1, [ ])
            SOURCES="$SOURCES $srcdir/src/timer/unix/*.c"
            have_timers=yes
        fi
        ;;
    *)
        AC_MSG_ERROR([
*** Unsupported host:  Please add to configure.in
        ])
        ;;
esac

dnl Do this on all platforms, after everything else.
CheckWarnAll

# Verify that we have all the platform specific files we need

if test x$have_joystick != xyes; then
    if test x$enable_joystick = xyes; then
        AC_DEFINE(SDL_JOYSTICK_DISABLED, 1, [ ])
    fi
    SOURCES="$SOURCES $srcdir/src/joystick/dummy/*.c"
fi
if test x$have_haptic != xyes; then
    if test x$enable_haptic = xyes; then
        AC_DEFINE(SDL_HAPTIC_DISABLED, 1, [ ])
    fi
    SOURCES="$SOURCES $srcdir/src/haptic/dummy/*.c"
fi
if test x$have_threads != xyes; then
    if test x$enable_threads = xyes; then
        AC_DEFINE(SDL_THREADS_DISABLED, 1, [ ])
    fi
    SOURCES="$SOURCES $srcdir/src/thread/generic/*.c"
fi
if test x$have_timers != xyes; then
    if test x$enable_timers = xyes; then
        AC_DEFINE(SDL_TIMERS_DISABLED, 1, [ ])
    fi
    SOURCES="$SOURCES $srcdir/src/timer/dummy/*.c"
fi
if test x$have_filesystem != xyes; then
    if test x$enable_filesystem = xyes; then
        AC_DEFINE(SDL_FILESYSTEM_DISABLED, 1, [ ])
    fi
    SOURCES="$SOURCES $srcdir/src/filesystem/dummy/*.c"
fi
if test x$have_loadso != xyes; then
    if test x$enable_loadso = xyes; then
        AC_DEFINE(SDL_LOADSO_DISABLED, 1, [ ])
    fi
    SOURCES="$SOURCES $srcdir/src/loadso/dummy/*.c"
fi
if test x$SDLMAIN_SOURCES = x; then
    SDLMAIN_SOURCES="$srcdir/src/main/dummy/*.c"
fi
SDLTEST_SOURCES="$srcdir/src/test/*.c"

OBJECTS=`echo $SOURCES`
DEPENDS=`echo $SOURCES | tr ' ' '\n'`
for EXT in asm cc m c S; do
    OBJECTS=`echo "$OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.'$EXT',$(objects)/\1.lo,g'`
    DEPENDS=`echo "$DEPENDS" | sed "s,^\\([[^ ]]*\\)/\\([[^ ]]*\\)\\.$EXT\\$,\\\\
\\$(objects)/\\2.lo: \\1/\\2.$EXT\\\\
	\\$(RUN_CMD_CC)\\$(LIBTOOL) --tag=CC --mode=compile \\$(CC) \\$(CFLAGS) \\$(EXTRA_CFLAGS) $DEPENDENCY_TRACKING_OPTIONS -c \\$< -o \\$@,g"`
done

VERSION_OBJECTS=`echo $VERSION_SOURCES`
VERSION_DEPENDS=`echo $VERSION_SOURCES`
VERSION_OBJECTS=`echo "$VERSION_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.rc,$(objects)/\1.o,g'`
VERSION_DEPENDS=`echo "$VERSION_DEPENDS" | sed "s,\\([[^ ]]*\\)/\\([[^ ]]*\\)\\.rc,\\\\
\\$(objects)/\\2.o: \\1/\\2.rc\\\\
	\\$(WINDRES) \\$< \\$@,g"`

SDLMAIN_OBJECTS=`echo $SDLMAIN_SOURCES`
SDLMAIN_DEPENDS=`echo $SDLMAIN_SOURCES`
SDLMAIN_OBJECTS=`echo "$SDLMAIN_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.c,$(objects)/\1.o,g'`
SDLMAIN_DEPENDS=`echo "$SDLMAIN_DEPENDS" | sed "s,\\([[^ ]]*\\)/\\([[^ ]]*\\)\\.c,\\\\
\\$(objects)/\\2.o: \\1/\\2.c\\\\
	\\$(RUN_CMD_CC)\\$(LIBTOOL) --tag=CC --mode=compile \\$(CC) \\$(CFLAGS) \\$(EXTRA_CFLAGS) $DEPENDENCY_TRACKING_OPTIONS -c \\$< -o \\$@,g"`

SDLTEST_OBJECTS=`echo $SDLTEST_SOURCES`
SDLTEST_DEPENDS=`echo $SDLTEST_SOURCES`
SDLTEST_OBJECTS=`echo "$SDLTEST_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.c,$(objects)/\1.o,g'`
SDLTEST_DEPENDS=`echo "$SDLTEST_DEPENDS" | sed "s,\\([[^ ]]*\\)/\\([[^ ]]*\\)\\.c,\\\\
\\$(objects)/\\2.o: \\1/\\2.c\\\\
	\\$(RUN_CMD_CC)\\$(LIBTOOL) --tag=CC --mode=compile \\$(CC) \\$(CFLAGS) \\$(EXTRA_CFLAGS) $DEPENDENCY_TRACKING_OPTIONS -c \\$< -o \\$@,g"`

# Set runtime shared library paths as needed

if test "x$enable_rpath" = "xyes"; then
  if test $ARCH = bsdi -o $ARCH = freebsd -o $ARCH = linux -o $ARCH = netbsd; then
    SDL_RLD_FLAGS="-Wl,-rpath,\${libdir}"
  fi
  if test $ARCH = solaris; then
    SDL_RLD_FLAGS="-R\${libdir}"
  fi
else
  SDL_RLD_FLAGS=""
fi

SDL_STATIC_LIBS="$SDL_LIBS $EXTRA_LDFLAGS"

dnl Expand the cflags and libraries needed by apps using SDL
AC_SUBST(SDL_CFLAGS)
AC_SUBST(SDL_LIBS)
AC_SUBST(SDL_STATIC_LIBS)
AC_SUBST(SDL_RLD_FLAGS)
if test x$enable_shared = xyes; then
    ENABLE_SHARED_TRUE=
    ENABLE_SHARED_FALSE="#"
else
    ENABLE_SHARED_TRUE="#"
    ENABLE_SHARED_FALSE=
fi
if test x$enable_static = xyes; then
    ENABLE_STATIC_TRUE=
    ENABLE_STATIC_FALSE="#"
else
    ENABLE_STATIC_TRUE="#"
    ENABLE_STATIC_FALSE=
fi
AC_SUBST(ENABLE_SHARED_TRUE)
AC_SUBST(ENABLE_SHARED_FALSE)
AC_SUBST(ENABLE_STATIC_TRUE)
AC_SUBST(ENABLE_STATIC_FALSE)

dnl Expand the sources and objects needed to build the library
AC_SUBST(ac_aux_dir)
AC_SUBST(INCLUDE)
AC_SUBST(OBJECTS)
AC_SUBST(VERSION_OBJECTS)
AC_SUBST(SDLMAIN_OBJECTS)
AC_SUBST(SDLTEST_OBJECTS)
AC_SUBST(BUILD_CFLAGS)
AC_SUBST(EXTRA_CFLAGS)
AC_SUBST(BUILD_LDFLAGS)
AC_SUBST(EXTRA_LDFLAGS)
AC_SUBST(WINDRES)

cat >Makefile.rules <<__EOF__

# Build rules for objects
-include \$(OBJECTS:.lo=.d)

# Special dependency for SDL.c, since it depends on SDL_revision.h
$srcdir/src/SDL.c: update-revision
$DEPENDS
$VERSION_DEPENDS
$SDLMAIN_DEPENDS
$SDLTEST_DEPENDS
__EOF__

AC_CONFIG_FILES([
    Makefile:Makefile.in:Makefile.rules sdl2-config sdl2-config.cmake SDL2.spec sdl2.pc
])
AC_CONFIG_COMMANDS([sdl2_config],[chmod a+x sdl2-config])

SUMMARY="SDL2 Configure Summary:\n"
if test x$enable_shared = xyes; then
    SUMMARY="${SUMMARY}Building Shared Libraries\n"
fi
if test x$enable_static = xyes; then
    SUMMARY="${SUMMARY}Building Static Libraries\n"
fi
SUMMARY="${SUMMARY}Enabled modules :${SUMMARY_modules}\n"
SUMMARY="${SUMMARY}Assembly Math   :${SUMMARY_math}\n" 
SUMMARY="${SUMMARY}Audio drivers   :${SUMMARY_audio}\n"
SUMMARY="${SUMMARY}Video drivers   :${SUMMARY_video}\n"
if test x$have_x = xyes; then
    SUMMARY="${SUMMARY}X11 libraries   :${SUMMARY_video_x11}\n"
fi
SUMMARY="${SUMMARY}Input drivers   :${SUMMARY_input}\n"
if test x$enable_libudev = xyes; then
    SUMMARY="${SUMMARY}Using libudev   : YES\n"
else
    SUMMARY="${SUMMARY}Using libudev   : NO\n"
fi
if test x$have_dbus_dbus_h_hdr = xyes; then
    SUMMARY="${SUMMARY}Using dbus      : YES\n"
else
    SUMMARY="${SUMMARY}Using dbus      : NO\n"
fi
if test x$have_ibus_ibus_h_hdr = xyes; then
    SUMMARY="${SUMMARY}Using ibus      : YES\n"
else
    SUMMARY="${SUMMARY}Using ibus      : NO\n"
fi
AC_CONFIG_COMMANDS([summary], [echo -en "$SUMMARY"], [SUMMARY="$SUMMARY"])

AC_OUTPUT