diff --git a/ANNOUNCE b/ANNOUNCE
index 976c293..17aba38 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -167,12 +167,6 @@
 version 1.2.41rc02 [November 22, 2009]
   Rebuilt the configure scripts with autoconf-2.65
 
-version 1.2.41rc03 [November 25, 2009]
-  Disabled the new pedantic warnings about deprecated function use and
-    deprecated structure access unless the user defines PNG_PEDANTIC_WARNINGS.
-  Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
-  Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
-
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 8611727..a30803a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2595,12 +2595,6 @@
 version 1.2.41rc02 [November 22, 2009]
   Rebuilt the configure scripts with autoconf-2.65
 
-version 1.2.41rc03 [November 25, 2009]
-  Disabled the new pedantic warnings about deprecated function use and
-    deprecated structure access unless the user defines PNG_PEDANTIC_WARNINGS.
-  Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
-  Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
-
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/png.c b/png.c
index 5be01ff..28e04ba 100644
--- a/png.c
+++ b/png.c
@@ -13,7 +13,6 @@
 
 #define PNG_INTERNAL
 #define PNG_NO_EXTERN
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
diff --git a/pngconf.h b/pngconf.h
index c4c4ffa..62eb0e8 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1522,29 +1522,23 @@
 #  endif
 #endif
 
-#ifdef PNG_PEDANTIC_WARNINGS
-#  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
-#    define PNG_PEDANTIC_WARNINGS_SUPPORTED
-#  endif
-#endif
-
-#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
 /* Support for compiler specific function attributes.  These are used
  * so that where compiler support is available incorrect use of API
  * functions in png.h will generate compiler warnings.  Added at libpng
  * version 1.2.41.
  */
-#  ifdef __GNUC__
-#    ifndef PNG_USE_RESULT
-#      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
-#    endif
-#    ifndef PNG_NORETURN
-#      define PNG_NORETURN   __attribute__((__noreturn__))
-#    endif
-#    ifndef PNG_ALLOCATED
-#      define PNG_ALLOCATED  __attribute__((__malloc__))
-#    endif
+#ifdef __GNUC__
+#  ifndef PNG_USE_RESULT
+#    define PNG_USE_RESULT __attribute__((__warn_unused_result__))
+#  endif
+#  ifndef PNG_NORETURN
+#    define PNG_NORETURN   __attribute__((__noreturn__))
+#  endif
+#  ifndef PNG_ALLOCATED
+#    define PNG_ALLOCATED  __attribute__((__malloc__))
+#  endif
 
+#  ifndef PNG_CONFIGURE_LIBPNG
     /* This specifically protects structure members that should only be
      * accessed from within the library, therefore should be empty during
      * a library build.
@@ -1556,16 +1550,16 @@
 #      define PNG_DEPSTRUCT  __attribute__((__deprecated__))
 #    endif
 #    ifndef PNG_PRIVATE
-#      if 0 /* Doesn't work so we use deprecated instead*/
-#        define PNG_PRIVATE \
-          __attribute__((warning("This function is not exported by libpng.")))
-#      else
-#        define PNG_PRIVATE \
-          __attribute__((__deprecated__))
-#      endif
-#    endif /* PNG_PRIVATE */
-#  endif /* __GNUC__ */
-#endif /* PNG_PEDANTIC_WARNINGS */
+#if 0 /* Doesn't work so we use deprecated instead*/
+#      define PNG_PRIVATE \
+        __attribute__((warning("This function is not exported by libpng.")))
+#else
+#      define PNG_PRIVATE \
+        __attribute__((__deprecated__))
+#endif
+#    endif
+#  endif
+#endif
 
 #ifndef PNG_DEPRECATED
 #  define PNG_DEPRECATED  /* Use of this function is deprecated */
diff --git a/pngerror.c b/pngerror.c
index 2cbf5e0..1d72dbf 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -17,7 +17,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngget.c b/pngget.c
index 46d4f70..e8c4d36 100644
--- a/pngget.c
+++ b/pngget.c
@@ -13,7 +13,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngmem.c b/pngmem.c
index ba301c6..1a0a5b5 100644
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,7 +1,7 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * Last changed in libpng 1.2.41 [November 25, 2009]
+ * Last changed in libpng 1.2.37 [June 4, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -18,7 +18,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngpread.c b/pngpread.c
index 2d09ee2..239c04d 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.41 [November 25, 2009]
+ * Last changed in libpng 1.2.38 [July 16, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 
diff --git a/pngread.c b/pngread.c
index 1272f41..f0f1fd9 100644
--- a/pngread.c
+++ b/pngread.c
@@ -15,7 +15,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngrio.c b/pngrio.c
index db379fb..1a641a6 100644
--- a/pngrio.c
+++ b/pngrio.c
@@ -19,7 +19,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngrtran.c b/pngrtran.c
index 0925f13..56be15d 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -17,7 +17,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngrutil.c b/pngrutil.c
index 5a74048..3f41d1e 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -15,7 +15,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngset.c b/pngset.c
index 9dfc816..9df57ee 100644
--- a/pngset.c
+++ b/pngset.c
@@ -17,7 +17,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngtest.c b/pngtest.c
index 27a64d9..efca9ae 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -31,7 +31,6 @@
  * of files at once by typing "pngtest -m file1.png file2.png ..."
  */
 
-#define PNG_PEDANTIC_WARNINGS
 #include "png.h"
 
 #ifdef _WIN32_WCE
diff --git a/pngtrans.c b/pngtrans.c
index aa01b4c..4065d4d 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngwio.c b/pngwio.c
index 87c1691..c70e038 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -19,7 +19,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/pngwrite.c b/pngwrite.c
index 11f967b..e6b5da0 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -13,7 +13,6 @@
 
 /* Get internal access to png.h */
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/pngwtran.c b/pngwtran.c
index 1105d89..82e6641 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/pngwutil.c b/pngwutil.c
index e7e0a2d..24916ec 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/projects/visualc6/libpng.dsp b/projects/visualc6/libpng.dsp
index 6f611f7..8bb5f1b 100644
--- a/projects/visualc6/libpng.dsp
+++ b/projects/visualc6/libpng.dsp
@@ -56,8 +56,8 @@
 # ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -87,8 +87,8 @@
 # ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG" /d PNG_DEBUG=1
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -118,8 +118,8 @@
 # ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG" /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG" /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -149,8 +149,8 @@
 # ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1 /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG" /d PNG_DEBUG=1 /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -180,8 +180,8 @@
 # ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG" /dPNG_LIBPNG_DLLFNAME_POSTFIX=""""VB"""" /dPNG_LIBPNG_SPECIALBUILD=""""__stdcall calling convention used for exported functions""""
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG" /dPNG_LIBPNG_DLLFNAME_POSTFIX=""""VB"""" /dPNG_LIBPNG_SPECIALBUILD=""""__stdcall calling convention used for exported functions""""
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -213,8 +213,8 @@
 # ADD CPP /nologo /MD /W3 /O2 /I "..\.." /I "..\..\..\zlib" /D "PNG_NO_MMX_CODE" /D "WIN32" /D "NDEBUG" /D "_CRT_SECURE_NO_WARNINGS" /FD /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -240,8 +240,8 @@
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "DEBUG" /D "PNG_NO_MMX_CODE" /D PNG_DEBUG=1 /D "_CRT_SECURE_NO_WARNINGS" /FD /GZ /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /d "_DEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -267,8 +267,8 @@
 # ADD CPP /nologo /MD /W3 /O2 /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "PNG_USE_PNGVCRD" /D "PNG_LIBPNG_SPECIALBUILD" /D "_CRT_SECURE_NO_WARNINGS" /FD /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -294,8 +294,8 @@
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "DEBUG" /D PNG_DEBUG=1 /D "PNG_USE_PNGVCRD" /D "PNG_LIBPNG_SPECIALBUILD" /D "_CRT_SECURE_NO_WARNINGS" /FD /GZ /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /d "_DEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
diff --git a/projects/visualc71/libpng.vcproj b/projects/visualc71/libpng.vcproj
index 794e289..03bb96f 100644
--- a/projects/visualc71/libpng.vcproj
+++ b/projects/visualc71/libpng.vcproj
@@ -139,7 +139,7 @@
 				Name="VCPreLinkEventTool"/>
 			<Tool
 				Name="VCResourceCompilerTool"
-				AdditionalOptions="/d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
+				AdditionalOptions="/d PNG_CONFIGURE_LIBPNG /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
 				PreprocessorDefinitions="NDEBUG;_CRT_SECURE_NO_WARNINGS"
 				Culture="1033"
 				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
@@ -188,7 +188,7 @@
 				Name="VCPreLinkEventTool"/>
 			<Tool
 				Name="VCResourceCompilerTool"
-				AdditionalOptions="/d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
+				AdditionalOptions="/d PNG_CONFIGURE_LIBPNG /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
 				PreprocessorDefinitions="_DEBUG,PNG_DEBUG=1;_CRT_SECURE_NO_WARNINGS"
 				Culture="1033"
 				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
@@ -236,7 +236,7 @@
 				Name="VCPreLinkEventTool"/>
 			<Tool
 				Name="VCResourceCompilerTool"
-				AdditionalOptions="/d PNG_LIBPNG_DLLFNAME_POSTFIX=&quot;&quot;&quot;&quot;VB&quot;&quot;&quot;&quot; /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;__stdcall calling convention used for exported functions&quot;&quot;&quot;&quot;"
+				AdditionalOptions="/d PNG_CONFIGURE_LIBPNG /d PNG_LIBPNG_DLLFNAME_POSTFIX=&quot;&quot;&quot;&quot;VB&quot;&quot;&quot;&quot; /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;__stdcall calling convention used for exported functions&quot;&quot;&quot;&quot;"
 				PreprocessorDefinitions="NDEBUG;_CRT_SECURE_NO_WARNINGS"
 				Culture="1033"
 				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index fb9cedf..7c654dc 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -49,7 +49,7 @@
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) $(SUN_CC_FLAGS) \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) $(SUN_CC_FLAGS) \
 	# $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=$(SUN_LD_FLAGS) -L$(ZLIBLIB) -R$(ZLIBLIB) libpng.a -lz -lm
 
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index de2044c..2ea026e 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -49,7 +49,7 @@
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) $(SUN_CC_FLAGS) \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) $(SUN_CC_FLAGS) \
 	# $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -R. $(SUN_LD_FLAGS) -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
 
diff --git a/scripts/makefile.acorn b/scripts/makefile.acorn
index a0e577b..e2630d7 100644
--- a/scripts/makefile.acorn
+++ b/scripts/makefile.acorn
@@ -2,7 +2,7 @@
 
 
 # Toolflags:
-CCflags = -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah
+CCflags = -DPNG_CONFIGURE_LIBPNG -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah
 C++flags = -c -depend !Depend -IC: -throwback
 Linkflags = -aif -c++ -o $@
 ObjAsmflags = -throwback -NoCache -depend !Depend
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index ce9b8f9..a57b7a4 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -48,7 +48,7 @@
 CRELEASE = -O2
 LDRELEASE = -s
 WARNMORE=-W -Wall
-CFLAGS = -I$(ZLIBINC) $(WARNMORE) $(CRELEASE)
+CFLAGS = -DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) $(WARNMORE) $(CRELEASE)
 LDFLAGS = -L. -L$(ZLIBLIB) -lpng12 -lz -lm $(LDRELEASE)
 
 # File extensions
diff --git a/scripts/makefile.amiga b/scripts/makefile.amiga
index 8bf0f45..6a64260 100644
--- a/scripts/makefile.amiga
+++ b/scripts/makefile.amiga
@@ -15,7 +15,7 @@
 #compiler flags
 # WARNING: a bug in V6.51 causes bad code with OPTGO
 #          So use V6.55 or set NOOPTGO!!!!!!!!!
-CFLAGS= NOSTKCHK PARMS=REG OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL\
+CFLAGS= -DPNG_CONFIGURE_LIBPNG NOSTKCHK PARMS=REG OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL\
 	OPTLOOP OPTRDEP=4 OPTDEP=4 OPTCOMP=4 INCLUDEDIR=$(ZLIB) \
 	DEFINE=PNG_INTERNAL
 #linker flags
diff --git a/scripts/makefile.atari b/scripts/makefile.atari
index 0e1ca72..d265524 100644
--- a/scripts/makefile.atari
+++ b/scripts/makefile.atari
@@ -9,7 +9,7 @@
 # Modified for LC56/ATARI assumes libz.lib is in same dir and uses default
 # rules for library management
 #
-CFLAGS=-I..\zlib -O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I..\zlib -O
 LBR = png.lib
 LDFLAGS=-lpng -lz -lm
 
diff --git a/scripts/makefile.bc32 b/scripts/makefile.bc32
index 4b96231..82dd080 100644
--- a/scripts/makefile.bc32
+++ b/scripts/makefile.bc32
@@ -43,7 +43,7 @@
 # -d  merge duplicate strings
 # -k- turn off standard stack frame
 # -w  display all warnings
-CFLAGS=-I$(ZLIB_DIR) -O2 -d -k- -w $(TARGET_CPU) $(CDEBUG)
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIB_DIR) -O2 -d -k- -w $(TARGET_CPU) $(CDEBUG)
 
 # -M  generate map file
 LDFLAGS=-L$(ZLIB_DIR) -M $(LDEBUG)
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 98e6a41..26b0c53 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -44,7 +44,7 @@
 
 # On BeOS, -O1 is actually better than -O3.  This is a known bug but it's
 # still here in R4.5
-CFLAGS=-I$(ZLIBINC) -W -Wall -O1 -funroll-loops \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O1 -funroll-loops \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 # LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz
 LDFLAGS=-L. -Wl,-soname=$(LIBSOMAJ) -L$(ZLIBLIB) -lz
diff --git a/scripts/makefile.bor b/scripts/makefile.bor
index e803184..fd54504 100644
--- a/scripts/makefile.bor
+++ b/scripts/makefile.bor
@@ -51,7 +51,7 @@
 # -w  set all warnings on
 # -O2 optimize for speed
 # -Z  global optimization
-CFLAGS=-O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)
 
 # -M  generate map file
 LDFLAGS=-M -L$(ZLIB_DIR) $(MODEL_ARG) $(LDEBUG)
diff --git a/scripts/makefile.cegcc b/scripts/makefile.cegcc
index 55e710f..1ca750e 100644
--- a/scripts/makefile.cegcc
+++ b/scripts/makefile.cegcc
@@ -64,7 +64,7 @@
 
 compilation:
 	@echo " * Compilation of $(PACKAGE)"
-	cd $(PACKAGE) && CPPFLAGS="$(CPPFLAGS) -DPNG_BUILD_DLL -DPNG_CONSOLE_IO_SUPPORTED -DPNG_NO_MMX_CODE -D_WIN32_WCE=0x0420" CFLAGS="$(CFLAGS) -mms-bitfields -O3 -pipe -fomit-frame-pointer" LDFLAGS="$(LDFLAGS) -Wl,--enable-auto-import -Wl,-s" ./configure --prefix=/opt/wince --host=arm-mingw32ce && make
+	cd $(PACKAGE) && CPPFLAGS="$(CPPFLAGS) -DPNG_BUILD_DLL -DPNG_CONSOLE_IO_SUPPORTED -DPNG_NO_MMX_CODE -D_WIN32_WCE=0x0420" CFLAGS="$(CFLAGS) -DPNG_CONFIGURE_LIBPNG -mms-bitfields -O3 -pipe -fomit-frame-pointer" LDFLAGS="$(LDFLAGS) -Wl,--enable-auto-import -Wl,-s" ./configure --prefix=/opt/wince --host=arm-mingw32ce && make
 
 copy:
 	@echo " * Copy of binary and development files"
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index 031d1aa..6db83d0 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -36,7 +36,7 @@
 
 CC=gcc
 ifdef MINGW
-MINGW_CCFLAGS=-mno-cygwin -I/usr/include/mingw
+MINGW_CCFLAGS=-DPNG_CONFIGURE_LIBPNG -mno-cygwin -I/usr/include/mingw
 MINGW_LDFLAGS=-mno-cygwin -L/usr/lib/mingw
 endif
 
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index d337bd2..084df5a 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -41,7 +41,7 @@
 RANLIB=ranlib
 RM_F=/bin/rm -f
 
-# CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE
+# CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE
 CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O -funroll-loops
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz
 
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 6cc77d4..045851c 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -57,7 +57,7 @@
 ZLIBLIB=../zlib
 ZLIBINC=../zlib
 
-CFLAGS=-std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
 LDFLAGS=-L$(ZLIBLIB) -rpath $(ZLIBLIB) libpng.a -lz -lm
 
 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
diff --git a/scripts/makefile.dj2 b/scripts/makefile.dj2
index b8457ee..f37ec96 100644
--- a/scripts/makefile.dj2
+++ b/scripts/makefile.dj2
@@ -13,7 +13,7 @@
 LIBPATH=$(prefix)/lib
 
 CC=gcc
-CFLAGS=-I../zlib -O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I../zlib -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
 
 RANLIB=ranlib
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 78438ef..4e910b5 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -57,7 +57,7 @@
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-W -Wall -D_REENTRANT -O2 \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -W -Wall -D_REENTRANT -O2 \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 
 LDFLAGS=-L. -lpng12
diff --git a/scripts/makefile.freebsd b/scripts/makefile.freebsd
index daf91bd..5b31465 100644
--- a/scripts/makefile.freebsd
+++ b/scripts/makefile.freebsd
@@ -27,7 +27,7 @@
 LDADD+=         -lm -lz
 DPADD+=         ${LIBM} ${LIBZ}
 
-CFLAGS+= -I.
+CFLAGS+= -DPNG_CONFIGURE_LIBPNG -I.
 .if (${MACHINE_ARCH} != "i386")
 CFLAGS+= -DPNG_CONFIGURE_LIBPNG -DPNG_NO_MMX_CODE
 .endif
diff --git a/scripts/makefile.gcc b/scripts/makefile.gcc
index ed7cd86..2eff467 100644
--- a/scripts/makefile.gcc
+++ b/scripts/makefile.gcc
@@ -22,8 +22,8 @@
 LDDEBUG =
 CRELEASE = -O2
 LDRELEASE = -s
-#CFLAGS = -W -Wall $(CDEBUG)
-CFLAGS = -W -Wall $(CRELEASE)
+#CFLAGS = -DPNG_CONFIGURE_LIBPNG -W -Wall $(CDEBUG)
+CFLAGS = -DPNG_CONFIGURE_LIBPNG -W -Wall $(CRELEASE)
 #LDFLAGS = $(LDDEBUG)
 LDFLAGS = $(LDRELEASE)
 LIBS = -lz -lm
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index 7587361..5a94a3d 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -14,7 +14,7 @@
 # Note that if you plan to build a libpng shared library, zlib must also
 # be a shared library, which zlib's configure does not do.  After running
 # zlib's configure, edit the appropriate lines of makefile to read:
-#   CFLAGS=-O1 -DHAVE_UNISTD -DUSE_MAP -fPIC \
+#   CFLAGS=-DPNG_CONFIGURE_LIBPNG -O1 -DHAVE_UNISTD -DUSE_MAP -fPIC \
 #   LDSHARED=ld -b
 #   SHAREDLIB=libz.sl
 
@@ -40,10 +40,10 @@
 RANLIB=ranlib
 RM_F=/bin/rm -f
 
-CFLAGS=-I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 +Z -DHAVE_UNISTD_H -DUSE_MMAP
 # Caution: be sure you have built zlib with the same CFLAGS.
-CCFLAGS=-I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
+CCFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 +Z -DHAVE_UNISTD_H -DUSE_MMAP
 
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index abd84fa..2a7072d 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -56,7 +56,7 @@
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 #LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz -lm
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 80991de..d5c8f0b 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -48,9 +48,9 @@
 MANPATH=$(prefix)/man
 BINPATH=$(exec_prefix)/bin
 
-CFLAGS=-I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0 -DPNG_NO_MMX_CODE
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0 -DPNG_NO_MMX_CODE
 # Caution: be sure you have built zlib with the same CFLAGS.
-CCFLAGS=-I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0
+CCFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 # override DESTDIR= on the make install command line to easily support
diff --git a/scripts/makefile.ibmc b/scripts/makefile.ibmc
index 3d540d2..8d02a83 100644
--- a/scripts/makefile.ibmc
+++ b/scripts/makefile.ibmc
@@ -23,7 +23,7 @@
 AR = ilib
 RM = del
 
-CFLAGS = -I$(ZLIBINC) -Mc -O2 -W3
+CFLAGS = -DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -Mc -O2 -W3
 LDFLAGS =
 
 # File extensions
diff --git a/scripts/makefile.intel b/scripts/makefile.intel
index 3b1cdde..79f34ed 100644
--- a/scripts/makefile.intel
+++ b/scripts/makefile.intel
@@ -32,7 +32,7 @@
 # --------------------------------------------------------------------------
 
 CC=icl -c
-CFLAGS=-O2 -G$(CPU)$(CALLING) -Qip -Qunroll4 -I$(ZLIBINC) -nologo
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -O2 -G$(CPU)$(CALLING) -Qip -Qunroll4 -I$(ZLIBINC) -nologo
 LD=link
 LDFLAGS=/SUBSYSTEM:CONSOLE /NOLOGO
 
diff --git a/scripts/makefile.knr b/scripts/makefile.knr
index 3a20674..7545319 100644
--- a/scripts/makefile.knr
+++ b/scripts/makefile.knr
@@ -27,7 +27,7 @@
 DESTDIR=
 
 CC=cc
-CFLAGS=-I../zlib -O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I../zlib -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
 # flags for ansi2knr
 ANSI2KNRFLAGS=
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 397c857..67c514d 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -51,7 +51,7 @@
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 212379a..e6d45f2 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -62,15 +62,15 @@
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
 
 ### if you don't need thread safety, but want the asm accel
-#CFLAGS= $(strip $(MINGW_CCFLAGS) -DPNG_THREAD_UNSAFE_OK \
+#CFLAGS= -DPNG_CONFIGURE_LIBPNG $(strip $(MINGW_CCFLAGS) -DPNG_THREAD_UNSAFE_OK \
 #	$(addprefix -I,$(ZLIBINC)) -W -Wall -O $(ALIGN) -funroll-loops \
 #	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### if you need thread safety and want (minimal) asm accel
-#CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
+#CFLAGS= -DPNG_CONFIGURE_LIBPNG $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 #	-W -Wall -O $(ALIGN) -funroll-loops \
 #	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### Normal (non-asm) compilation
-CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
+CFLAGS= -DPNG_CONFIGURE_LIBPNG $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
         -W -Wall -O3 $(ALIGN) -funroll-loops -DPNG_NO_MMX_CODE \
 	-fomit-frame-pointer) # $(WARNMORE) -g -DPNG_DEBUG=5
 
diff --git a/scripts/makefile.mips b/scripts/makefile.mips
index 2c7082d..8765066 100644
--- a/scripts/makefile.mips
+++ b/scripts/makefile.mips
@@ -22,8 +22,8 @@
 DESTDIR=
 
 CC=cc
-CFLAGS=-I../zlib -O -systype sysv -DSYSV -w -Dmips
-#CFLAGS=-O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I../zlib -O -systype sysv -DSYSV -w -Dmips
+#CFLAGS=-DPNG_CONFIGURE_LIBPNG -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
 
 #RANLIB=ranlib
diff --git a/scripts/makefile.msc b/scripts/makefile.msc
index df9e84d..d5a9ba1 100644
--- a/scripts/makefile.msc
+++ b/scripts/makefile.msc
@@ -10,7 +10,7 @@
 
 # -------- Microsoft C 5.1 and later, does not use assembler code --------
 MODEL=L
-CFLAGS=-Oait -Gs -nologo -W3 -A$(MODEL) -I..\zlib
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -Oait -Gs -nologo -W3 -A$(MODEL) -I..\zlib
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 432b9a3..7a94815 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -29,10 +29,10 @@
 # We should be able to do something like this instead of the manual
 # uncommenting, but it core dumps for me at the moment:
 # .if ${MACHINE_ARCH} == "i386"
-#   CPPFLAGS+=-DPNG_THREAD_UNSAFE_OK
+#   CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_THREAD_UNSAFE_OK
 #   MKLINT= no
 # .else
-    CPPFLAGS+=-DPNG_NO_MMX_CODE
+    CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_NO_MMX_CODE
 # .endif
 
 CLEANFILES+=pngtest.o pngtest
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index 9a10110..dbf962a 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -29,10 +29,10 @@
 # We should be able to do something like this instead of the manual
 # uncommenting, but it core dumps for me at the moment:
 # .if ${MACHINE_ARCH} == "i386"
-#   CPPFLAGS+=-DPNG_THREAD_UNSAFE_OK
+#   CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_THREAD_UNSAFE_OK
 #   MKLINT= no
 # .else
-    CPPFLAGS+=-DPNG_NO_MMX_CODE
+    CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_NO_MMX_CODE
 # .endif
 
 CLEANFILES+=pngtest.o pngtest
diff --git a/scripts/makefile.nommx b/scripts/makefile.nommx
index f152f0d..c7bc833 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -51,7 +51,7 @@
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index eca9b3d..b9604ef 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -20,7 +20,7 @@
 
 HDRS=	png.h pngconf.h
 
-CFLAGS+= -W -Wall
+CFLAGS+= -DPNG_CONFIGURE_LIBPNG -W -Wall
 CPPFLAGS+= -I${.CURDIR} -DPNG_NO_MMX_CODE
 
 NOPROFILE= Yes
diff --git a/scripts/makefile.os2 b/scripts/makefile.os2
index 907cfc8..e190c0a 100644
--- a/scripts/makefile.os2
+++ b/scripts/makefile.os2
@@ -15,7 +15,7 @@
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) -W -Wall -O6 -funroll-loops -malign-loops=2 \
+CFLAGS=--DPNG_CONFIGURE_LIBPNG I$(ZLIBINC) -W -Wall -O6 -funroll-loops -malign-loops=2 \
 	-malign-functions=2 #$(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lzdll -Zcrtdll
 AR=emxomfar
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 607bdfa..4ce7413 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -41,7 +41,7 @@
 ZLIBLIB=../zlib
 ZLIBINC=../zlib
 
-CFLAGS= -dy -belf -I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
+CFLAGS= -DPNG_CONFIGURE_LIBPNG -dy -belf -I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz -lm
 
 INCPATH=$(prefix)/include/libpng
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index aa63d69..b298be3 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -47,7 +47,7 @@
 ABI=
 
 WARNMORE= # -g -DPNG_DEBUG=5
-CFLAGS=$(ABI) -I$(ZLIBINC) -O $(WARNMORE) -fPIC -mabi=n32 -DPNG_NO_MMX_CODE
+CFLAGS=-DPNG_CONFIGURE_LIBPNG $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -fPIC -mabi=n32 -DPNG_NO_MMX_CODE
 LDFLAGS=$(ABI) -L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=cc $(ABI) -shared -soname $(LIBSOMAJ) \
   -set_version sgi$(PNGMAJ).0
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index 9435fd6..17f4591 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -48,8 +48,8 @@
 
 WARNMORE=-fullwarn
 # Note: -KPIC is the default anyhow
-#CFLAGS= $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -KPIC -DPNG_NO_MMX_CODE # -g -DPNG_DEBUG=5
-CFLAGS=$(ABI) -I$(ZLIBINC) -O $(WARNMORE) -DPNG_NO_MMX_CODE
+#CFLAGS= -DPNG_CONFIGURE_LIBPNG $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -KPIC -DPNG_NO_MMX_CODE # -g -DPNG_DEBUG=5
+CFLAGS=-DPNG_CONFIGURE_LIBPNG $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -DPNG_NO_MMX_CODE
 LDFLAGS_A=$(ABI) -L. -L$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS=$(ABI) -L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=cc $(ABI) -shared -soname $(LIBSOMAJ) \
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index 3cbfcb7..2c8668a 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -50,8 +50,8 @@
 #WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-#CFLAGS=-I$(ZLIBINC) -W -Wall -O3 $(WARNMORE) -g -DPNG_DEBUG=5 -DPNG_NO_MMX_CODE
-CFLAGS=-I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
+#CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 $(WARNMORE) -g -DPNG_DEBUG=5 -DPNG_NO_MMX_CODE
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
 LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
 
 INCPATH=$(prefix)/include
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index 6ed4f6b..d57734c 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -46,7 +46,7 @@
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) -W -Wall -O -DPNG_NO_MMX_CODE; \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O -DPNG_NO_MMX_CODE; \
 	# $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
 
diff --git a/scripts/makefile.std b/scripts/makefile.std
index 262d153..abbf9b9 100644
--- a/scripts/makefile.std
+++ b/scripts/makefile.std
@@ -34,7 +34,7 @@
 RANLIB=ranlib
 RM_F=rm -f
 
-CFLAGS=-I$(ZLIBINC) -O # -g -DPNG_DEBUG=5
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O # -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
diff --git a/scripts/makefile.sunos b/scripts/makefile.sunos
index 0cef4fc..7feb04c 100644
--- a/scripts/makefile.sunos
+++ b/scripts/makefile.sunos
@@ -39,7 +39,7 @@
 RANLIB=ranlib
 RM_F=/bin/rm -f
 
-CFLAGS=-I$(ZLIBINC) -O # $(WARNMORE) -DPNG_DEBUG=5
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O # $(WARNMORE) -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
diff --git a/scripts/makefile.tc3 b/scripts/makefile.tc3
index 21435a6..951af0d 100644
--- a/scripts/makefile.tc3
+++ b/scripts/makefile.tc3
@@ -6,8 +6,8 @@
 # ----- Turbo C 3.00 (can be modified to work with earlier versions) -----
 
 MODEL=l
-CFLAGS=-O2 -Z -m$(MODEL) -I..\zlib
-#CFLAGS=-D_NO_PROTO -O2 -Z -m$(MODEL) -I..\zlib  # Turbo C older than 3.00
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -O2 -Z -m$(MODEL) -I..\zlib
+#CFLAGS=-DPNG_CONFIGURE_LIBPNG -D_NO_PROTO -O2 -Z -m$(MODEL) -I..\zlib  # Turbo C older than 3.00
 CC=tcc
 LD=tcc
 LIB=tlib
diff --git a/scripts/makefile.vcawin32 b/scripts/makefile.vcawin32
index 1b58300..533cb29 100644
--- a/scripts/makefile.vcawin32
+++ b/scripts/makefile.vcawin32
@@ -16,7 +16,7 @@
 CC = cl
 LD = link
 AR = lib
-CFLAGS  = -nologo -DPNG_USE_PNGVCRD -MD -O2 -W3 -I..\zlib
+CFLAGS  = -DPNG_CONFIGURE_LIBPNG -nologo -DPNG_USE_PNGVCRD -MD -O2 -W3 -I..\zlib
 LDFLAGS = -nologo
 ARFLAGS = -nologo
 RM = del
diff --git a/scripts/makefile.vcwin32 b/scripts/makefile.vcwin32
index 3cdfb39..38e834a 100644
--- a/scripts/makefile.vcwin32
+++ b/scripts/makefile.vcwin32
@@ -16,7 +16,7 @@
 CC = cl
 LD = link
 AR = lib
-CFLAGS  = -nologo -DPNG_NO_MMX_CODE -MD -O2 -W3 -I..\zlib
+CFLAGS  = -DPNG_CONFIGURE_LIBPNG -nologo -DPNG_NO_MMX_CODE -MD -O2 -W3 -I..\zlib
 LDFLAGS = -nologo
 ARFLAGS = -nologo
 RM = del
diff --git a/scripts/makefile.watcom b/scripts/makefile.watcom
index 4a8c7d7..bff6ebc 100644
--- a/scripts/makefile.watcom
+++ b/scripts/makefile.watcom
@@ -36,7 +36,7 @@
 
 
 CC=wcc386
-CFLAGS=-$(CPU)$(CALLING) -fp$(CPU) -fpi87 -oneatx -mf -bt=$(OS) -i=$(ZLIBINC) -zq
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -$(CPU)$(CALLING) -fp$(CPU) -fpi87 -oneatx -mf -bt=$(OS) -i=$(ZLIBINC) -zq
 LD=wcl386
 LDFLAGS=-zq