diff --git a/ANNOUNCE b/ANNOUNCE
index baae703..73023ac 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.20beta04 - August 21, 2007
+Libpng 1.2.20rc1 - August 23, 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.
@@ -9,32 +9,32 @@
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.2.20beta04.tar.gz
-   libpng-1.2.20beta04.tar.bz2
+   libpng-1.2.20rc1.tar.gz
+   libpng-1.2.20rc1.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.2.20beta04-no-config.tar.gz
-   libpng-1.2.20beta04-no-config.tar.bz2
+   libpng-1.2.20rc1-no-config.tar.gz
+   libpng-1.2.20rc1-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1220b04.zip
-   lp1220b04.tar.bz2
+   lp1220r01.zip
+   lp1220r01.tar.bz2
 
 Project files
 
-   libpng-1.2.20beta04-project-netware.zip
-   libpng-1.2.20beta04-project-wince.zip
+   libpng-1.2.20rc1-project-netware.zip
+   libpng-1.2.20rc1-project-wince.zip
 
 Other information:
 
-   libpng-1.2.20beta04-README.txt
-   libpng-1.2.20beta04-KNOWNBUGS.txt
-   libpng-1.2.20beta04-LICENSE.txt
-   libpng-1.2.20beta04-Y2K-compliance.txt
+   libpng-1.2.20rc1-README.txt
+   libpng-1.2.20rc1-KNOWNBUGS.txt
+   libpng-1.2.20rc1-LICENSE.txt
+   libpng-1.2.20rc1-Y2K-compliance.txt
 
 Changes since the last public release (1.2.19):
 
@@ -54,6 +54,9 @@
 version 1.2.20beta04 [August 21, 2007]
   Revised pngvcrd.c for improved efficiency (Steve Snyder).
 
+version 1.2.20beta05 [August 23, 2007]
+  Revised pngconf.h to set PNG_NO_MMX_CODE for gcc-3.x compilers.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 
 (subscription required; visit 
diff --git a/CHANGES b/CHANGES
index cab8c26..a7abb0a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1911,6 +1911,9 @@
 version 1.2.20beta04 [August 21, 2007]
   Revised pngvcrd.c for improved efficiency (Steve Snyder).
 
+version 1.2.20beta05 [August 23, 2007]
+  Revised pngconf.h to set PNG_NO_MMX_CODE for gcc-3.x compilers.
+
 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/INSTALL b/INSTALL
index 0d462af..2d7d9f8 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.2.20beta04 - August 21, 2007
+Installing libpng version 1.2.20rc1 - August 23, 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-1.2.20beta04" or "lpng109" and "zlib-1.2.1"
+might be called "libpng-1.2.20rc1" 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.0.1.2.20beta04)
+                       gcc, creates libpng12.so.0.1.2.20rc1)
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.20beta04)
+                       (gcc, creates libpng12.so.0.1.2.20rc1)
  makefile.gcmmx    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.20beta04,
+                       (gcc, creates libpng12.so.0.1.2.20rc1,
                        uses assembler code tuned for Intel MMX platform)
  makefile.nommx    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.20beta04
+                       (gcc, creates libpng12.so.0.1.2.20rc1
                        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
@@ -131,14 +131,14 @@
  makefile.openbsd  =>  OpenBSD makefile
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.20beta04)
+                       creates libpng12.so.0.1.2.20rc1)
  makefile.sunos    =>  Sun makefile
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.20beta04)
+                       creates libpng12.so.0.1.2.20rc1)
  makefile.solaris-x86 =>  Solaris/intelMMX 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.20beta04)
+                       creates libpng12.so.0.1.2.20rc1)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.20beta04)
+                       creates libpng12.so.0.1.2.20rc1)
  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 bc82b4c..5be6c9f 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.2.20beta04
+Known bugs in libpng version 1.2.20rc1
 
 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 1e65f36..727adc5 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 1.2.20beta04, August 21, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.20rc1, August 23, 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
-August 21, 2007
+August 23, 2007
diff --git a/README b/README
index 731fc89..3454fdb 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.2.20beta04 - August 21, 2007 (shared library 12.0)
+README for libpng version 1.2.20rc1 - August 23, 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.0.1.2.20beta04)
+                            gcc, creates libpng12.so.0.1.2.20rc1)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.20beta04)
+                            (gcc, creates libpng12.so.0.1.2.20rc1)
        makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.20beta04,
+                            (gcc, creates libpng12.so.0.1.2.20rc1,
                             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.0.1.2.20beta04)
+                            (gcc, creates libpng12.so.0.1.2.20rc1)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.20beta04)
+                            (gcc, creates libpng12.so.0.1.2.20rc1)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.20beta04)
+                            (gcc, creates libpng12.so.0.1.2.20rc1)
        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 e50a69c..df146af 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      August 21, 2007
+      August 23, 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 1.2.20beta04 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.20rc1 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 81291a1..a6725bf 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 1.2.20beta04.
+# Generated by GNU Autoconf 2.61 for libpng 1.2.20rc1.
 #
 # 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='1.2.20beta04'
-PACKAGE_STRING='libpng 1.2.20beta04'
+PACKAGE_VERSION='1.2.20rc1'
+PACKAGE_STRING='libpng 1.2.20rc1'
 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 1.2.20beta04 to adapt to many kinds of systems.
+\`configure' configures libpng 1.2.20rc1 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 1.2.20beta04:";;
+     short | recursive ) echo "Configuration of libpng 1.2.20rc1:";;
    esac
   cat <<\_ACEOF
 
@@ -1585,7 +1585,7 @@
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.2.20beta04
+libpng configure 1.2.20rc1
 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 1.2.20beta04, which was
+It was created by libpng $as_me 1.2.20rc1, 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='1.2.20beta04'
+ VERSION='1.2.20rc1'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2440,7 +2440,7 @@
 
 
 
-PNGLIB_VERSION=1.2.20beta04
+PNGLIB_VERSION=1.2.20rc1
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=20
@@ -21282,7 +21282,7 @@
 # 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 1.2.20beta04, which was
+This file was extended by libpng $as_me 1.2.20rc1, which was
 generated by GNU Autoconf 2.61.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -21335,7 +21335,7 @@
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
 ac_cs_version="\\
-libpng config.status 1.2.20beta04
+libpng config.status 1.2.20rc1
 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 a2601f0..0b57348 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,12 +18,12 @@
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.2.20beta04], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.20rc1], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.2.20beta04
+PNGLIB_VERSION=1.2.20rc1
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=20
diff --git a/libpng-1.2.20beta04.txt b/libpng-1.2.20rc1.txt
similarity index 99%
rename from libpng-1.2.20beta04.txt
rename to libpng-1.2.20rc1.txt
index fce8d4e..c0727cc 100644
--- a/libpng-1.2.20beta04.txt
+++ b/libpng-1.2.20rc1.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.20beta04 - August 21, 2007
+ libpng version 1.2.20rc1 - August 23, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2007 Glenn Randers-Pehrson
@@ -2968,13 +2968,13 @@
 
 IX. Y2K Compliance in libpng
 
-August 21, 2007
+August 23, 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 1.2.20beta04 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.20rc1 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 866c023..0bcbf2c 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "August 21, 2007"
+.TH LIBPNG 3 "August 23, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20beta04
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20rc1
 .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 1.2.20beta04 - August 21, 2007
+ libpng version 1.2.20rc1 - August 23, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2007 Glenn Randers-Pehrson
@@ -3378,13 +3378,13 @@
 
 .SH IX. Y2K Compliance in libpng
 
-August 21, 2007
+August 23, 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 1.2.20beta04 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.20rc1 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
@@ -3579,6 +3579,8 @@
  1.0.27              10    10027  10.so.0.27[.0]
  1.2.19              13    10219  12.so.0.19[.0]
  1.2.20beta01-04     13    10220  12.so.0.20[.0]
+ 1.0.28rc1           10    10028  10.so.0.28[.0]
+ 1.2.20rc1           13    10220  12.so.0.20[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3634,7 +3636,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.2.20beta04 - August 21, 2007:
+Libpng version 1.2.20rc1 - August 23, 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).
 
@@ -3655,7 +3657,7 @@
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.20beta04, August 21, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.20rc1, August 23, 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
@@ -3754,7 +3756,7 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-August 21, 2007
+August 23, 2007
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index 5627330..5bc9878 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "August 21, 2007"
+.TH LIBPNGPF 3 "August 23, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20beta04
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20rc1
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index 8c7e17a..0f2d982 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "August 21, 2007"
+.TH PNG 5 "August 23, 2007"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index cd29cd1..71c3600 100644
--- a/png.c
+++ b/png.c
@@ -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_20beta04 Your_png_h_is_not_version_1_2_20beta04;
+typedef version_1_2_20rc1 Your_png_h_is_not_version_1_2_20rc1;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
@@ -698,7 +698,7 @@
 png_get_copyright(png_structp png_ptr)
 {
    png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.2.20beta04 - August 21, 2007\n\
+   return ((png_charp) "\n libpng version 1.2.20rc1 - August 23, 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 b9f6b71..071f3a4 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.20beta04 - August 21, 2007
+ * libpng version 1.2.20rc1 - August 23, 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 1.2.20beta04 - August 21, 2007: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.20rc1 - August 23, 2007: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -156,6 +156,8 @@
  *    1.0.27                  10    10027  10.so.0.27[.0]
  *    1.2.19                  13    10219  12.so.0.19[.0]
  *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
+ *    1.0.28rc1               10    10028  10.so.0.28[.0]
+ *    1.2.20rc1               13    10220  12.so.0.20[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -185,7 +187,7 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.20beta04, August 21, 2007, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.20rc1, August 23, 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:
@@ -297,13 +299,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    August 21, 2007
+ *    August 23, 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 1.2.20beta04 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.20rc1 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
@@ -359,9 +361,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.20beta04"
+#define PNG_LIBPNG_VER_STRING "1.2.20rc1"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.20beta04 - August 21, 2007\n"
+   " libpng version 1.2.20rc1 - August 23, 2007\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -373,7 +375,7 @@
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
 
-#define PNG_LIBPNG_VER_BUILD  04
+#define PNG_LIBPNG_VER_BUILD  1
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -390,7 +392,7 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_RC
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
@@ -1412,7 +1414,7 @@
 /* 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_20beta04;
+typedef png_structp version_1_2_20rc1;
 
 typedef png_struct FAR * FAR * png_structpp;
 
diff --git a/pngconf.h b/pngconf.h
index d09d52b..409c1c2 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.20beta04 - August 21, 2007
+ * libpng version 1.2.20rc1 - August 23, 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)
@@ -749,6 +749,13 @@
 #    define PNG_ASSEMBLER_CODE_SUPPORTED
 #  endif
 
+#  if defined(__GNUC__) && defined(__x86_64__) && (__GNUC__ < 4)
+     /* work around 64-bit gcc compiler bugs in gcc-3.x */
+#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#      define PNG_NO_MMX_CODE
+#    endif
+#  endif
+
 #  if defined(__APPLE__)
 #    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
 #      define PNG_NO_MMX_CODE
@@ -1502,18 +1509,15 @@
 #    ifndef PNG_NO_MMX_FILTER_SUB
 #      define PNG_MMX_READ_FILTER_SUB_SUPPORTED
 #    endif
-#    if !(defined(__GNUC__) && defined(__x86_64__) && (__GNUC__ < 4))
-       /* work around 64-bit gcc compiler bugs in gcc-3.x */
-#      ifndef PNG_NO_MMX_FILTER_UP
-#        define PNG_MMX_READ_FILTER_UP_SUPPORTED
-#      endif
-#      ifndef PNG_NO_MMX_FILTER_AVG
-#        define PNG_MMX_READ_FILTER_AVG_SUPPORTED
-#      endif
-#      ifndef PNG_NO_MMX_FILTER_PAETH
-#        define PNG_MMX_READ_FILTER_PAETH_SUPPORTED
-#      endif
-#    endif /* !((__x86_64__) && (GNUC < 4)) */
+#    ifndef PNG_NO_MMX_FILTER_UP
+#      define PNG_MMX_READ_FILTER_UP_SUPPORTED
+#    endif
+#    ifndef PNG_NO_MMX_FILTER_AVG
+#      define PNG_MMX_READ_FILTER_AVG_SUPPORTED
+#    endif
+#    ifndef PNG_NO_MMX_FILTER_PAETH
+#      define PNG_MMX_READ_FILTER_PAETH_SUPPORTED
+#    endif
 #  endif
   /* These are the default thresholds before the MMX code kicks in; if either
    * rowbytes or bitdepth is below the threshold, plain C code is used.  These
diff --git a/pngerror.c b/pngerror.c
index be6d4f2..0c2161c 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,7 +1,7 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * Last changed in libpng 1.2.20 August 21, 2007
+ * Last changed in libpng 1.2.20 August 23, 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 610a7da..e27f2bd 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.20 August 21, 2007
+ * Last changed in libpng 1.2.20 August 23, 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 2b69332..d0a72e6 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1548,4 +1548,4 @@
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_20beta04 your_png_h_is_not_version_1_2_20beta04;
+typedef version_1_2_20rc1 your_png_h_is_not_version_1_2_20rc1;
diff --git a/pngvcrd.c b/pngvcrd.c
index 3990b72..0226557 100644
--- a/pngvcrd.c
+++ b/pngvcrd.c
@@ -3,7 +3,7 @@
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *
- * Last changed in libpng 1.2.20 August 21, 2007
+ * Last changed in libpng 1.2.20 August 23, 2007
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * Copyright (c) 1998, Intel Corporation
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index 19c806b..c2c5a36 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -180,7 +180,7 @@
 
 # SET UP LINKS
 set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#    VERSION 0.${PNGLIB_RELEASE}.1.2.20beta04
+#    VERSION 0.${PNGLIB_RELEASE}.1.2.20rc1
      VERSION 0.${PNGLIB_RELEASE}.0
      SOVERSION 0
      CLEAN_DIRECT_OUTPUT 1)
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 47bb1f7..d79cc92 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -8,7 +8,7 @@
 
 # Modeled after libxml-config.
 
-version=1.2.20beta04
+version=1.2.20rc1
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc-configure.in b/scripts/libpng.pc-configure.in
index 3cedd7c..713d41c 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: 1.2.20beta04
+Version: 1.2.20rc1
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir} @LIBPNG_NO_MMX@
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index a3a0acf..341156d 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.20beta04
+Version: 1.2.20rc1
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index 4b8bd51..ea28e61 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index 23be2cd..0364180 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index ad93f2d..ac40d7e 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -20,7 +20,7 @@
 
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 582df24..4d2cb60 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index d28cee2..9439338 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -77,7 +77,7 @@
 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index 6a5a27a..a06abfc 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -19,7 +19,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 38a956b..d7c2561 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -5,7 +5,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index a269ecd..b7ee2a7 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -12,7 +12,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index fa8a229..a5b451d 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -16,7 +16,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index e1e5283..f34e4b5 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -18,7 +18,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index ff5cd2f..14abd9c 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 0ec6635..107f845 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -18,7 +18,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index bf21d6f..db7ccdf 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 96de7a1..f0c81ed 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -78,7 +78,7 @@
 LIBNAME = libpng12
 PNGMAJ = 0
 MINGDLL = 12
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 71fba69..fd50fa0 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -14,7 +14,7 @@
 
 LIB=	png12
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.20beta04
+SHLIB_MINOR=	1.2.20rc1
 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 80ae886..eecb6e5 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -14,7 +14,7 @@
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.2.20beta04
+SHLIB_MINOR=	1.2.20rc1
 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 f37daec..a8150f2 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -7,7 +7,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index 47cb0ef..2310f1c 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -8,7 +8,7 @@
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.20beta04
+SHLIB_MINOR=	1.2.20rc1
 
 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 1f8c0a7..85aba1f 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index 927a4fa..f49d911 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index 0613fde..dbd9a84 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index e7f71a8..f5c93bb 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -8,7 +8,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index caa386e..8e3780c 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.solaris-x86 b/scripts/makefile.solaris-x86
index d69a40c..6c27a2f 100644
--- a/scripts/makefile.solaris-x86
+++ b/scripts/makefile.solaris-x86
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.20beta04
+PNGMIN = 1.2.20rc1
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index 9361356..a93cd8b 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.2.20beta04
+; Version 1.2.20rc1
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngw32.def b/scripts/pngw32.def
index a642d83..c441e18 100644
--- a/scripts/pngw32.def
+++ b/scripts/pngw32.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.2.20beta04
+;Version 1.2.20rc1
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3