diff --git a/ANNOUNCE b/ANNOUNCE
index 7b6e70f..0e9136f 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.17rc1 - May 4, 2007
+Libpng 1.2.17rc2 - May 9, 2007
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,36 +9,36 @@
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.2.17rc1.tar.gz
-   libpng-1.2.17rc1.tar.bz2
+   libpng-1.2.17rc2.tar.gz
+   libpng-1.2.17rc2.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.2.17rc1-no-config.tar.gz
-   libpng-1.2.17rc1-no-config.tar.bz2
+   libpng-1.2.17rc2-no-config.tar.gz
+   libpng-1.2.17rc2-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1217r01.zip
-   lp1217r01.tar.bz2
+   lp1217r02.zip
+   lp1217r02.tar.bz2
 
 Project files
 
-   libpng-1.2.17rc1-project-netware.zip
-   libpng-1.2.17rc1-project-wince.zip
+   libpng-1.2.17rc2-project-netware.zip
+   libpng-1.2.17rc2-project-wince.zip
 
 Other information:
 
-   libpng-1.2.17rc1-README.txt
-   libpng-1.2.17rc1-KNOWNBUGS.txt
-   libpng-1.2.17rc1-LICENSE.txt
-   libpng-1.2.17rc1-Y2K-compliance.txt
+   libpng-1.2.17rc2-README.txt
+   libpng-1.2.17rc2-KNOWNBUGS.txt
+   libpng-1.2.17rc2-LICENSE.txt
+   libpng-1.2.17rc2-Y2K-compliance.txt
 
 Changes since the last public release (1.2.16):
 
-version 1.2.17beta1 [May 4, 2007]
+version 1.2.17beta1 [May 9, 2007]
   Revised scripts/CMakeLists.txt to install both shared and static libraries.
   Deleted a redundant line from pngset.c.
 
@@ -49,9 +49,18 @@
   Added "const" to some array declarations.
   Mention examples of libpng usage in the libpng*.txt and libpng.3 documents.
  
-version 1.2.17rc1 [May 4, 2007]
+version 1.2.17rc1 [May 5, 2007]
   No changes.
 
+version 1.2.17rc2 [May 9, 2007]
+  Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
+    calling set_unknown_chunk_location() need them.
+  Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
+    png_set_expand_gray_1_2_4_to_8().
+  Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
+    can be free'ed in case of error.  Revised unknown chunk handling in
+    pngrutil.c and pngpread.c to use this structure.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 
 (subscription required; visit 
diff --git a/CHANGES b/CHANGES
index ad11dad..4632af2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1704,6 +1704,15 @@
 
 version 1.2.17rc1 [May 4, 2007]
   No changes.
+
+version 1.2.17rc2 [May 9, 2007]
+  Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
+    calling set_unknown_chunk_location() need them.
+  Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
+    png_set_expand_gray_1_2_4_to_8().
+  Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
+    can be free'ed in case of error.  Revised unknown chunk handling in
+    pngrutil.c and pngpread.c to use this structure.
  
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/INSTALL b/INSTALL
index dd35939..9bb1644 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.2.17rc1 - May 4, 2007
+Installing libpng version 1.2.17rc2 - May 9, 2007
 
 On Unix/Linux and similar systems, you can simply type
 
@@ -44,7 +44,7 @@
 correspond to the version of zlib that's installed.
 
 You can rename the directories that you downloaded (they
-might be called "libpng-1.2.17rc1" or "lpng109" and "zlib-1.2.1"
+might be called "libpng-1.2.17rc2" or "lpng109" and "zlib-1.2.1"
 or "zlib121") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -101,14 +101,14 @@
  CMakeLists.txt    =>  "cmake" script
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng12.so.0.1.2.17rc1)
+                       gcc, creates libpng12.so.0.1.2.17rc2)
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.17rc1)
+                       (gcc, creates libpng12.so.0.1.2.17rc2)
  makefile.gcmmx    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.17rc1,
+                       (gcc, creates libpng12.so.0.1.2.17rc2,
                        uses assembler code tuned for Intel MMX platform)
  makefile.nommx    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.17rc1
+                       (gcc, creates libpng12.so.0.1.2.17rc2
                        does not use Intel MMX assembler code)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
@@ -131,12 +131,12 @@
  makefile.openbsd  =>  OpenBSD makefile
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.17rc1)
+                       creates libpng12.so.0.1.2.17rc2)
  makefile.sunos    =>  Sun makefile
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.17rc1)
+                       creates libpng12.so.0.1.2.17rc2)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.17rc1)
+                       creates libpng12.so.0.1.2.17rc2)
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
  makefile.64sunu   =>  Sun Ultra 64-bit makefile
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
diff --git a/KNOWNBUG b/KNOWNBUG
index db6d2b0..1c5bbc5 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.2.17rc1
+Known bugs in libpng version 1.2.17rc2
 
 1. April 22, 2001: pnggccrd.c has been reported to crash on NetBSD when
    reading interlaced PNG files, when assembler code is enabled but running
diff --git a/LICENSE b/LICENSE
index aa19153..9256d7f 100644
--- a/LICENSE
+++ b/LICENSE
@@ -8,7 +8,7 @@
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.17rc1, May 4, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.17rc2, May 9, 2007, are
 Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -106,4 +106,4 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-May 4, 2007
+May 9, 2007
diff --git a/README b/README
index 91f605b..8304034 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.2.17rc1 - May 4, 2007 (shared library 12.0)
+README for libpng version 1.2.17rc2 - May 9, 2007 (shared library 12.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
@@ -190,11 +190,11 @@
        descrip.mms      =>  VMS makefile for MMS or MMK
        makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
        makefile.elf     =>  Linux/ELF makefile symbol versioning,
-                            gcc, creates libpng12.so.0.1.2.17rc1)
+                            gcc, creates libpng12.so.0.1.2.17rc2)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.17rc1)
+                            (gcc, creates libpng12.so.0.1.2.17rc2)
        makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.17rc1,
+                            (gcc, creates libpng12.so.0.1.2.17rc2,
                             uses assembler code tuned for Intel MMX platform)
        makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
        makefile.knr     =>  Archaic UNIX Makefile that converts files with
@@ -216,12 +216,12 @@
        makefile.openbsd =>  OpenBSD makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
        makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng12.so.0.1.2.17rc1)
+                            (gcc, creates libpng12.so.0.1.2.17rc2)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.17rc1)
+                            (gcc, creates libpng12.so.0.1.2.17rc2)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.17rc1)
+                            (gcc, creates libpng12.so.0.1.2.17rc2)
        makefile.32sunu  =>  Sun Ultra 32-bit makefile
        makefile.64sunu  =>  Sun Ultra 64-bit makefile
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
diff --git a/Y2KINFO b/Y2KINFO
index d7ebfc8..732d906 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      May 4, 2007
+      May 9, 2007
 
       Since the PNG Development group is an ad-hoc body, we can't make
       an official declaration.
 
       This is your unofficial assurance that libpng from version 0.71 and
-      upward through 1.2.17rc1 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.17rc2 are Y2K compliant.  It is my belief that earlier
       versions were also Y2K compliant.
 
       Libpng only has three year fields.  One is a 2-byte unsigned integer
diff --git a/configure b/configure
index ef186d9..e074f6a 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.61 for libpng 1.2.17rc1.
+# Generated by GNU Autoconf 2.61 for libpng 1.2.17rc2.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -728,8 +728,8 @@
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.2.17rc1'
-PACKAGE_STRING='libpng 1.2.17rc1'
+PACKAGE_VERSION='1.2.17rc2'
+PACKAGE_STRING='libpng 1.2.17rc2'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 
 ac_unique_file="pngget.c"
@@ -1405,7 +1405,7 @@
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures libpng 1.2.17rc1 to adapt to many kinds of systems.
+\`configure' configures libpng 1.2.17rc2 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1475,7 +1475,7 @@
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.2.17rc1:";;
+     short | recursive ) echo "Configuration of libpng 1.2.17rc2:";;
    esac
   cat <<\_ACEOF
 
@@ -1585,7 +1585,7 @@
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.2.17rc1
+libpng configure 1.2.17rc2
 generated by GNU Autoconf 2.61
 
 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
@@ -1599,7 +1599,7 @@
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by libpng $as_me 1.2.17rc1, which was
+It was created by libpng $as_me 1.2.17rc2, which was
 generated by GNU Autoconf 2.61.  Invocation command line was
 
   $ $0 $@
@@ -2269,7 +2269,7 @@
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.2.17rc1'
+ VERSION='1.2.17rc2'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2440,7 +2440,7 @@
 
 
 
-PNGLIB_VERSION=1.2.17rc1
+PNGLIB_VERSION=1.2.17rc2
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=17
@@ -21119,7 +21119,7 @@
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by libpng $as_me 1.2.17rc1, which was
+This file was extended by libpng $as_me 1.2.17rc2, which was
 generated by GNU Autoconf 2.61.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -21172,7 +21172,7 @@
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
 ac_cs_version="\\
-libpng config.status 1.2.17rc1
+libpng config.status 1.2.17rc2
 configured by $0, generated by GNU Autoconf 2.61,
   with options \\"`echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`\\"
 
diff --git a/configure.ac b/configure.ac
index 01e5c8b..76c5721 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,12 +18,12 @@
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.2.17rc1], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.17rc2], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.2.17rc1
+PNGLIB_VERSION=1.2.17rc2
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=17
diff --git a/libpng-1.2.17rc1.txt b/libpng-1.2.17rc2.txt
similarity index 99%
rename from libpng-1.2.17rc1.txt
rename to libpng-1.2.17rc2.txt
index 4fa4e13..da8be2f 100644
--- a/libpng-1.2.17rc1.txt
+++ b/libpng-1.2.17rc2.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.17rc1 - May 4, 2007
+ libpng version 1.2.17rc2 - May 9, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2005 Glenn Randers-Pehrson
@@ -2921,13 +2921,13 @@
 
 IX. Y2K Compliance in libpng
 
-May 4, 2007
+May 9, 2007
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.17rc1 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.17rc2 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that
diff --git a/libpng.3 b/libpng.3
index 13808cb..54dff7d 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "May 4, 2007"
+.TH LIBPNG 3 "May 9, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.17rc1
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.17rc2
 .SH SYNOPSIS
 \fB
 #include <png.h>\fP
@@ -410,7 +410,7 @@
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.17rc1 - May 4, 2007
+ libpng version 1.2.17rc2 - May 9, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2005 Glenn Randers-Pehrson
@@ -3331,13 +3331,13 @@
 
 .SH IX. Y2K Compliance in libpng
 
-May 4, 2007
+May 9, 2007
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.17rc1 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.17rc2 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that
@@ -3520,8 +3520,8 @@
  1.0.24              10    10024  10.so.0.24[.0]
  1.2.16              13    10216  12.so.0.16[.0]
  1.2.17beta1-2       13    10217  12.so.0.17[.0]
- 1.0.25rc1           10    10025  10.so.0.25[.0]
- 1.2.17rc1           13    10217  12.so.0.17[.0]
+ 1.0.25rc1-2         10    10025  10.so.0.25[.0]
+ 1.2.17rc1-2         13    10217  12.so.0.17[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3577,7 +3577,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.2.17rc1 - May 4, 2007:
+Libpng version 1.2.17rc2 - May 9, 2007:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -3598,7 +3598,7 @@
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.17rc1, May 4, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.17rc2, May 9, 2007, are
 Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -3697,7 +3697,7 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-May 4, 2007
+May 9, 2007
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index e10aa5d..a235044 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "May 4, 2007"
+.TH LIBPNGPF 3 "May 9, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.17rc1
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.17rc2
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index 0bf6010..0b1460e 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "May 4, 2007"
+.TH PNG 5 "May 9, 2007"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index 25c2c95..06764ac 100644
--- a/png.c
+++ b/png.c
@@ -1,7 +1,7 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * Last changed in libpng 1.2.15 January 5, 2007
+ * Last changed in libpng 1.2.17 May 9, 2007
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -13,7 +13,7 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_17rc1 Your_png_h_is_not_version_1_2_17rc1;
+typedef version_1_2_17rc2 Your_png_h_is_not_version_1_2_17rc2;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
@@ -490,6 +490,11 @@
 #endif
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+  if(png_ptr->unknown_chunk.data)
+  {
+    png_free(png_ptr, png_ptr->unknown_chunk.data);
+    png_ptr->unknown_chunk.data = NULL;
+  }
 #ifdef PNG_FREE_ME_SUPPORTED
 if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
 #else
@@ -701,7 +706,7 @@
 png_get_copyright(png_structp png_ptr)
 {
    if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.2.17rc1 - May 4, 2007\n\
+   return ((png_charp) "\n libpng version 1.2.17rc2 - May 9, 2007\n\
    Copyright (c) 1998-2007 Glenn Randers-Pehrson\n\
    Copyright (c) 1996-1997 Andreas Dilger\n\
    Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
diff --git a/png.h b/png.h
index 7bb87c1..665115a 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.17rc1 - May 4, 2007
+ * libpng version 1.2.17rc2 - May 9, 2007
  * Copyright (c) 1998-2007 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.)
@@ -9,7 +9,7 @@
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.17rc1 - May 4, 2007: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.17rc2 - May 9, 2007: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -144,8 +144,8 @@
  *    1.0.24                  10    10024  10.so.0.24[.0]
  *    1.2.16                  13    10216  12.so.0.16[.0]
  *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
- *    1.0.25rc1               10    10025  10.so.0.25[.0]
- *    1.2.17rc1               13    10217  12.so.0.17[.0]
+ *    1.0.25rc1-2             10    10025  10.so.0.25[.0]
+ *    1.2.17rc1-2             13    10217  12.so.0.17[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -175,7 +175,7 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.17rc1, May 4, 2007, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.17rc2, May 9, 2007, are
  * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -287,13 +287,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    May 4, 2007
+ *    May 9, 2007
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.17rc1 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.17rc2 are Y2K compliant.  It is my belief that earlier
  *    versions were also Y2K compliant.
  *
  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -349,9 +349,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.17rc1"
+#define PNG_LIBPNG_VER_STRING "1.2.17rc2"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.17rc1 - May 4, 2007 (header)\n"
+   " libpng version 1.2.17rc2 - May 9, 2007 (header)\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -363,7 +363,7 @@
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
 
-#define PNG_LIBPNG_VER_BUILD  1
+#define PNG_LIBPNG_VER_BUILD  2
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -1391,13 +1391,18 @@
    png_uint_32 user_height_max;
 #endif
 
+/* New member added in libpng-1.0.25 and 1.2.17 */
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+   /* storage for unknown chunk that the library doesn't recognize. */
+   png_unknown_chunk unknown_chunk;
+#endif
 };
 
 
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_2_17rc1;
+typedef png_structp version_1_2_17rc2;
 
 typedef png_struct FAR * FAR * png_structpp;
 
@@ -2393,7 +2398,7 @@
    handling or default unknown chunk handling is not desired.  Any chunks not
    listed will be handled in the default manner.  The IHDR and IEND chunks
    must not be listed.
-      keep = 0: follow default behavour
+      keep = 0: follow default behaviour
            = 1: do not keep
            = 2: keep only if safe-to-copy
            = 3: keep even if unsafe-to-copy
@@ -2674,16 +2679,21 @@
  * be found in the files where the functions are located.
  */
 
-#if defined(PNG_INTERNAL)
 
-/* Various modes of operation.  Note that after an init, mode is set to
- * zero automatically when the structure is created.
+/* Various modes of operation, that are visible to applications because
+ * they are used for unknown chunk location.
  */
 #define PNG_HAVE_IHDR               0x01
 #define PNG_HAVE_PLTE               0x02
 #define PNG_HAVE_IDAT               0x04
 #define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
 #define PNG_HAVE_IEND               0x10
+
+#if defined(PNG_INTERNAL)
+
+/* More modes of operation.  Note that after an init, mode is set to
+ * zero automatically when the structure is created.
+ */
 #define PNG_HAVE_gAMA               0x20
 #define PNG_HAVE_cHRM               0x40
 #define PNG_HAVE_sRGB               0x80
diff --git a/pngconf.h b/pngconf.h
index 1d08652..a0541d8 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.17rc1 - May 4, 2007
+ * libpng version 1.2.17rc2 - May 9, 2007
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngpread.c b/pngpread.c
index b787443..05d772c 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,9 +1,9 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.13 November 13, 2006
+ * Last changed in libpng 1.2.17 May 9, 2007
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2006 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 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.)
  */
@@ -1488,8 +1488,6 @@
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
    if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
    {
-       png_unknown_chunk chunk;
-
 #ifdef PNG_MAX_MALLOC_64K
        if (length > (png_uint_32)65535L)
        {
@@ -1498,28 +1496,32 @@
            length = (png_uint_32)65535L;
        }
 #endif
-
-       png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
-       chunk.data = (png_bytep)png_malloc(png_ptr, length);
-       png_crc_read(png_ptr, chunk.data, length);
-       chunk.size = length;
+       png_strcpy((png_charp)png_ptr->unknown_chunk.name,
+         (png_charp)png_ptr->chunk_name);
+       png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
+       png_ptr->unknown_chunk.size = (png_size_t)length;
+       png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
        if(png_ptr->read_user_chunk_fn != NULL)
        {
           /* callback to user unknown chunk handler */
-          if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
+          int ret;
+          ret = (*(png_ptr->read_user_chunk_fn))
+            (png_ptr, &png_ptr->unknown_chunk);
+          if (ret < 0)
+             png_chunk_error(png_ptr, "error in user chunk");
+          if (ret == 0)
           {
              if (!(png_ptr->chunk_name[0] & 0x20))
                 if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
                      PNG_HANDLE_CHUNK_ALWAYS)
                    png_chunk_error(png_ptr, "unknown critical chunk");
           }
-             png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
        }
-       else
 #endif
-          png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
-       png_free(png_ptr, chunk.data);
+       png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+       png_free(png_ptr, png_ptr->unknown_chunk.data);
+       png_ptr->unknown_chunk.data = NULL;
    }
    else
 #endif
diff --git a/pngrtran.c b/pngrtran.c
index 7c3dc85..6ef0a1c 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -583,7 +583,7 @@
 {
    png_debug(1, "in png_set_expand_gray_1_2_4_to_8\n");
    if(png_ptr == NULL) return;
-   png_ptr->transformations |= PNG_EXPAND_tRNS;
+   png_ptr->transformations |= PNG_EXPAND;
 }
 #endif
 
diff --git a/pngrutil.c b/pngrutil.c
index 972d0f0..8cd186e 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.2.15 January 5, 2007
+ * Last changed in libpng 1.2.17 May 9, 2007
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -2173,8 +2173,6 @@
    if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) ||
        (png_ptr->read_user_chunk_fn != NULL))
    {
-       png_unknown_chunk chunk;
-
 #ifdef PNG_MAX_MALLOC_64K
        if (length > (png_uint_32)65535L)
        {
@@ -2183,30 +2181,32 @@
            length = (png_uint_32)65535L;
        }
 #endif
-       png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
-       chunk.data = (png_bytep)png_malloc(png_ptr, length);
-       chunk.size = (png_size_t)length;
-       png_crc_read(png_ptr, (png_bytep)chunk.data, length);
+       png_strcpy((png_charp)png_ptr->unknown_chunk.name,
+         (png_charp)png_ptr->chunk_name);
+       png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
+       png_ptr->unknown_chunk.size = (png_size_t)length;
+       png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
        if(png_ptr->read_user_chunk_fn != NULL)
        {
           /* callback to user unknown chunk handler */
-          if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
+          int ret;
+          ret = (*(png_ptr->read_user_chunk_fn))
+            (png_ptr, &png_ptr->unknown_chunk);
+          if (ret < 0)
+             png_chunk_error(png_ptr, "error in user chunk");
+          if (ret == 0)
           {
              if (!(png_ptr->chunk_name[0] & 0x20))
                 if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
                      PNG_HANDLE_CHUNK_ALWAYS)
-                 {
-                   png_free(png_ptr, chunk.data);
                    png_chunk_error(png_ptr, "unknown critical chunk");
-                 }
-             png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
           }
        }
-       else
 #endif
-          png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
-       png_free(png_ptr, chunk.data);
+       png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+       png_free(png_ptr, png_ptr->unknown_chunk.data);
+       png_ptr->unknown_chunk.data = NULL;
    }
    else
 #endif
diff --git a/pngset.c b/pngset.c
index 34d17e4..47f67e5 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.2.17 May 4, 2007
+ * Last changed in libpng 1.2.17 May 9, 2007
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngtest.c b/pngtest.c
index fac085f..579c861 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1551,4 +1551,4 @@
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_17rc1 your_png_h_is_not_version_1_2_17rc1;
+typedef version_1_2_17rc2 your_png_h_is_not_version_1_2_17rc2;
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index 367e3b7..9338b47 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -179,7 +179,7 @@
 
 # SET UP LINKS
 set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#    VERSION 0.${PNGLIB_RELEASE}.1.2.17rc1
+#    VERSION 0.${PNGLIB_RELEASE}.1.2.17rc2
      VERSION 0.${PNGLIB_RELEASE}.0
      SOVERSION 0
      CLEAN_DIRECT_OUTPUT 1)
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 2f1fa17..ede6c62 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -8,7 +8,7 @@
 
 # Modeled after libxml-config.
 
-version=1.2.17rc1
+version=1.2.17rc2
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc-configure.in b/scripts/libpng.pc-configure.in
index b1aae8e..131fb10 100644
--- a/scripts/libpng.pc-configure.in
+++ b/scripts/libpng.pc-configure.in
@@ -5,6 +5,6 @@
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.17rc1
+Version: 1.2.17rc2
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir} @LIBPNG_NO_MMX@
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 2e7fbeb..9158931 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.17rc1
+Version: 1.2.17rc2
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index 3c6a13e..50bd9b8 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index 26b8cf6..082f04f 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index 592d8db..a1cdbe6 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -20,7 +20,7 @@
 
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 97c3de9..ac70806 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index 87234f8..382e4e4 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -80,7 +80,7 @@
 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index bae83d0..3cf4756 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -19,7 +19,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 657fb4f..6922882 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -5,7 +5,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 175f304..3c3b739 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -12,7 +12,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index d13ec9d..2a13e80 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -16,7 +16,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index 1760ea7..36dd5b6 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -18,7 +18,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index af35409..b020621 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 45d4f98..4eb1afa 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -18,7 +18,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 0b6c50d..5acdb7b 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 2de4787..acdc7c2 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -76,7 +76,7 @@
 LIBNAME = libpng12
 PNGMAJ = 0
 MINGDLL = 12
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index d328d96..47e057b 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -14,7 +14,7 @@
 
 LIB=	png12
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.17rc1
+SHLIB_MINOR=	1.2.17rc2
 SRCS=	pnggccrd.c png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 		pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 		pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index 313356f..1c5771d 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -14,7 +14,7 @@
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.2.17rc1
+SHLIB_MINOR=	1.2.17rc2
 SRCS=	pnggccrd.c png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 		pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 		pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.nommx b/scripts/makefile.nommx
index ad16cb7..d9d0fba 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -7,7 +7,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index 3549530..ed32670 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -8,7 +8,7 @@
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.17rc1
+SHLIB_MINOR=	1.2.17rc2
 
 LIB=	png
 SRCS=	png.c pngerror.c pnggccrd.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index af8da2f..b424993 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index 92a211a..a2883f4 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index 39e6bd4..6de71ad 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index bd82aa5..72ed703 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -8,7 +8,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index af32dfe..a2f1f69 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.17rc1
+PNGMIN = 1.2.17rc2
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index d67c69a..7eb1fd9 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.2.17rc1
+; Version 1.2.17rc2
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngw32.def b/scripts/pngw32.def
index 97eff94..97f46d5 100644
--- a/scripts/pngw32.def
+++ b/scripts/pngw32.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.2.17rc1
+;Version 1.2.17rc2
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3