diff --git a/ANNOUNCE b/ANNOUNCE
index 44d0e02c..7baba2b4 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,48 +1,109 @@
 
-Libpng 1.2.45 - July 7, 2011
+Libpng 1.2.46rc01 - July 8, 2011
 
-This is a public release of libpng, intended for use in production codes.
+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.
 
 Files available for download:
 
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.2.45.tar.xz (LZMA-compressed, recommended)
-   libpng-1.2.45.tar.gz
-   libpng-1.2.45.tar.bz2
+   libpng-1.2.46rc01.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.46rc01.tar.gz
+   libpng-1.2.46rc01.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.2.45-no-config.tar.xz (LZMA-compressed, recommended)
-   libpng-1.2.45-no-config.tar.gz
-   libpng-1.2.45-no-config.tar.bz2
+   libpng-1.2.46rc01-no-config.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.46rc01-no-config.tar.gz
+   libpng-1.2.46rc01-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng1245.zip
-   lpng1245.7z
-   lpng1245.tar.bz2
+   lp1246r01.zip
+   lp1246r01.7z
+   lp1246r01.tar.bz2
 
 Project files
 
-   libpng-1.2.45-project-netware.zip
-   libpng-1.2.45-project-wince.zip
+   libpng-1.2.46rc01-project-netware.zip
+   libpng-1.2.46rc01-project-wince.zip
 
 Other information:
 
-   libpng-1.2.45-README.txt
-   libpng-1.2.45-KNOWNBUGS.txt
-   libpng-1.2.45-LICENSE.txt
-   libpng-1.2.45-Y2K-compliance.txt
-   libpng-1.2.45-[previous version]-diff.txt
+   libpng-1.2.46rc01-README.txt
+   libpng-1.2.46rc01-KNOWNBUGS.txt
+   libpng-1.2.46rc01-LICENSE.txt
+   libpng-1.2.46rc01-Y2K-compliance.txt
+   libpng-1.2.46rc01-[previous version]-diff.txt
 
-Changes since the last public release (1.2.43):
+Changes since the last public release (1.2.42):
 
-version 1.2.45 [July 7, 2011]
+version 1.2.43beta01 [January 27, 2010]
+  Updated CMakeLists.txt for consistent indentation and to avoid an
+    unclosed if-statement warning (Philip Lowman).
+  Removed "#ifdef PNG_1_0_X / #endif" surrounding
+    PNG_READ_16_TO_8_SUPPORTED and PNG_READ_GRAY_TO_RGB_SUPPORTED
+    in pngconf.h.  These were added in libpng-1.2.41beta08 and libpng-1.0.51,
+    which introduced a binary incompatibility with libpng-1.0.50.
+  Backported new png_decompress_chunk() algorithm from libpng-1.4.1
 
+version 1.2.43beta02 [February 1, 2010]
+  Backported two-pass png_decompress_chunk() algorithm from libpng-1.4.1
+
+version 1.2.43beta03 [February 6, 2010]
+  Backported fast png_push_save_buffer() algorithm from libpng-1.4.1
+
+version 1.2.43beta04 [February 8, 2010]
+  Reverted recent changes to png_push_save-buffer().
+  Removed PNGAPI declaration of png_calloc() and png_write_sig() in
+    1ibpng-1.2.X, introduced by mistake in libpng-1.2.41.
+  Return allocated "old_buffer" in png_push_save_buffer() before png_error(),
+    to avoid a potential memory leak.
+
+version 1.2.43beta05 [February 8, 2010]
+  Ported rewritten png_decompress_chunk() by John Bowler from libpng-1.4.1.
+
+version 1.0.53rc01 and 1.2.43rc01 [February 18, 2010]
+  No changes.
+
+version 1.0.53rc02 and 1.2.43rc02 [February 19, 2010]
+  Define _ALL_SOURCE in configure.ac, makefile.aix, and CMakeLists.txt
+    when using AIX compiler.
+
+version 1.0.53 and 1.2.43 [February 25, 2010]
+  Removed unused gzio.c from contrib/pngminim gather and makefile scripts
+
+version 1.2.44beta01 [June 18, 2010]
+  In pngpread.c: png_push_have_row() add check for new_row > height
+  Removed the now-redundant check for out-of-bounds new_row from example.c
+
+version 1.2.44beta02 [June 19, 2010]
+  In pngpread.c: png_push_process_row() add check for too many rows.
+  Removed the now-redundant check for new_row > height in png_push_have_row().
+
+version 1.2.44beta03 [June 20, 2010]
+  Rewrote png_process_IDAT_data to consistently treat extra data as warnings
+    and handle end conditions more cleanly.
+  Removed the new (beta02) check in png_push_process_row().
+
+version 1.2.44rc01 [June 21, 2010]
+  Revised some comments in png_process_IDAT_data().
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+
+version 1.2.44rc02 [June 22, 2010]
+  Stop memory leak when reading a malformed sCAL chunk.
+
+version 1.2.44rc03 [June 23, 2010]
+  Revised pngpread.c patch of beta05 to avoid an endless loop.
+
+version 1.2.44 [June 26, 2010]
+  Updated some of the "last changed" dates.
+
+version 1.2.45beta01 [June 7, 2011]
   Fixed uninitialized memory read in png_format_buffer() (Bug
     report by Frank Busse, related to CVE-2004-0421).
   Pass "" instead of '\0' to png_default_error() in png_err().  This mistake
@@ -51,10 +112,21 @@ version 1.2.45 [July 7, 2011]
     before IDAT.
   Ported bugfix in pngrtran.c from 1.5.3: when expanding a paletted image,
     always expand to RGBA if transparency is present.
+
+version 1.2.45beta02 [June 8, 2011]
   Check for integer overflow in png_set_rgb_to_gray().
+
+version 1.2.45beta03 [June 19, 2011]
   Check for sCAL chunk too short.
 
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+version 1.2.45rc01 and 1.0.55rc01 [June 30, 2011]
+  Updated "last changed" dates and copyright year.
+
+version 1.2.45 and 1.0.55 [July 7, 2011]
+  No changes.
+
+version 1.2.46rc01 and 1.0.56rc01 [July 8, 2011]
+  Reverted changes to Makefile.am and Makefile.in to libpng-1.2.44 versions.
 
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/CHANGES b/CHANGES
index 0c3c96c8..c5f74feb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2726,6 +2726,9 @@ version 1.2.45rc01 and 1.0.55rc01 [June 30, 2011]
 version 1.2.45 and 1.0.55 [July 7, 2011]
   No changes.
 
+version 1.2.46rc01 and 1.0.56rc01 [July 8, 2011]
+  Reverted changes to Makefile.am and Makefile.in to libpng-1.2.44 versions.
+
 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/CMakeLists.txt b/CMakeLists.txt
index c35e0812..79abd234 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ enable_testing()
 
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 2)
-set(PNGLIB_RELEASE 45)
+set(PNGLIB_RELEASE 46)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 
@@ -215,7 +215,7 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/libpng-config.in
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 0.${PNGLIB_RELEASE}.1.2.45
+#   VERSION 0.${PNGLIB_RELEASE}.1.2.46rc01
     VERSION 0.${PNGLIB_RELEASE}.0
     SOVERSION 0
     CLEAN_DIRECT_OUTPUT 1)
diff --git a/INSTALL b/INSTALL
index 799a96c7..0fdf7fc2 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.2.45 - July 7, 2011
+Installing libpng version 1.2.46rc01 - July 8, 2011
 
 On Unix/Linux and similar systems, you can simply type
 
@@ -46,7 +46,7 @@ to have access to the zlib.h and zconf.h include files that
 correspond to the version of zlib that's installed.
 
 You can rename the directories that you downloaded (they
-might be called "libpng-1.2.45" or "libpng12" and "zlib-1.2.3"
+might be called "libpng-1.2.46rc01" or "libpng12" and "zlib-1.2.3"
 or "zlib123") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
diff --git a/KNOWNBUG b/KNOWNBUG
index 626ecda2..45d0499f 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.2.45
+Known bugs in libpng version 1.2.46rc01
 
 1. February 23, 2006: The custom makefiles don't build libpng with -lz.
 
diff --git a/LICENSE b/LICENSE
index 4fe0e61c..bff44a71 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.45, July 7, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.46rc01, July 8, 2011, are
 Copyright (c) 2004, 2006-2009 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
@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-July 7, 2011
+July 8, 2011
diff --git a/Makefile.am b/Makefile.am
index c8be6c23..e00a6f0b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -86,7 +86,7 @@ EXTRA_DIST= \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.2.45.txt pngvcrd.c
+	example.c libpng-1.2.46rc01.txt pngvcrd.c
 
 CLEANFILES= pngout.png libpng12.pc libpng12-config libpng.vers \
 libpng.sym
@@ -102,8 +102,7 @@ $(PNGLIB_BASENAME)-config: libpng-config
 
 libpng.sym: png.h pngconf.h
 	rm -f $@ $@.new
-	$(CPP) @LIBPNG_DEFINES@ $(CPPFLAGS) -DPNG_BUILDSYMS $(srcdir)/png.h $(srcdir)/$@
-	cat $(srcdir)/$@ | \
+	$(CPP) @LIBPNG_DEFINES@ $(CPPFLAGS) -DPNG_BUILDSYMS $(srcdir)/png.h | \
 		$(SED) -n -e \
 		's|^.*PNG_FUNCTION_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
 		-e 's|^.*PNG_DATA_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
diff --git a/Makefile.in b/Makefile.in
index 57a9de6f..aa9875b0 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -351,7 +351,7 @@ EXTRA_DIST = \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.2.45.txt pngvcrd.c
+	example.c libpng-1.2.46rc01.txt pngvcrd.c
 
 CLEANFILES = pngout.png libpng12.pc libpng12-config libpng.vers \
 libpng.sym
@@ -1354,8 +1354,7 @@ $(PNGLIB_BASENAME)-config: libpng-config
 
 libpng.sym: png.h pngconf.h
 	rm -f $@ $@.new
-	$(CPP) @LIBPNG_DEFINES@ $(CPPFLAGS) -DPNG_BUILDSYMS $(srcdir)/png.h $(srcdir)/$@
-	cat $(srcdir)/$@ | \
+	$(CPP) @LIBPNG_DEFINES@ $(CPPFLAGS) -DPNG_BUILDSYMS $(srcdir)/png.h | \
 		$(SED) -n -e \
 		's|^.*PNG_FUNCTION_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
 		-e 's|^.*PNG_DATA_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
diff --git a/README b/README
index 8d017db2..8741edfb 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.2.45 - July 7, 2011 (shared library 12.0)
+README for libpng version 1.2.46rc01 - July 8, 2011 (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.
@@ -199,11 +199,11 @@ Files in this distribution:
        makefile.std     =>  Generic UNIX makefile (cc, creates static
                             libpng.a)
        makefile.elf     =>  Linux/ELF gcc makefile symbol versioning,
-                            creates libpng12.so.0.1.2.45)
+                            creates libpng12.so.0.1.2.46rc01)
        makefile.linux   =>  Linux/ELF makefile (gcc, creates
-                            libpng12.so.0.1.2.45)
+                            libpng12.so.0.1.2.46rc01)
        makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng12.so.0.1.2.45, previously
+                            libpng12.so.0.1.2.46rc01, previously
                             used assembler code tuned for Intel MMX
                             platform)
        makefile.gcc     =>  Generic makefile (gcc, creates static
@@ -228,12 +228,12 @@ Files in this distribution:
        makefile.openbsd =>  OpenBSD makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
        makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng12.so.0.1.2.45)
+                            (gcc, creates libpng12.so.0.1.2.46rc01)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.45)
+                            (gcc, creates libpng12.so.0.1.2.46rc01)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.45)
+                            (gcc, creates libpng12.so.0.1.2.46rc01)
        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 ccc9f4f3..fb5baa9a 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      July 7, 2011
+      July 8, 2011
 
       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 1.2.45 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.46rc01 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 da4d5879..4442091c 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.65 for libpng 1.2.45.
+# Generated by GNU Autoconf 2.65 for libpng 1.2.46rc01.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -701,8 +701,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.2.45'
-PACKAGE_STRING='libpng 1.2.45'
+PACKAGE_VERSION='1.2.46rc01'
+PACKAGE_STRING='libpng 1.2.46rc01'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1435,7 +1435,7 @@ if test "$ac_init_help" = "long"; then
   # 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 1.2.45 to adapt to many kinds of systems.
+\`configure' configures libpng 1.2.46rc01 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1505,7 +1505,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.2.45:";;
+     short | recursive ) echo "Configuration of libpng 1.2.46rc01:";;
    esac
   cat <<\_ACEOF
 
@@ -1612,7 +1612,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.2.45
+libpng configure 1.2.46rc01
 generated by GNU Autoconf 2.65
 
 Copyright (C) 2009 Free Software Foundation, Inc.
@@ -2037,7 +2037,7 @@ cat >config.log <<_ACEOF
 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 1.2.45, which was
+It was created by libpng $as_me 1.2.46rc01, which was
 generated by GNU Autoconf 2.65.  Invocation command line was
 
   $ $0 $@
@@ -2845,7 +2845,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.2.45'
+ VERSION='1.2.46rc01'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2909,10 +2909,10 @@ fi
 
 
 
-PNGLIB_VERSION=1.2.45
+PNGLIB_VERSION=1.2.46rc01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
-PNGLIB_RELEASE=45
+PNGLIB_RELEASE=46
 
 
 
@@ -12079,7 +12079,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # 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 1.2.45, which was
+This file was extended by libpng $as_me 1.2.46rc01, which was
 generated by GNU Autoconf 2.65.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -12145,7 +12145,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-libpng config.status 1.2.45
+libpng config.status 1.2.46rc01
 configured by $0, generated by GNU Autoconf 2.65,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 1dc14774..07f5b376 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,15 +18,15 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.2.45], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.46rc01], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.2.45
+PNGLIB_VERSION=1.2.46rc01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
-PNGLIB_RELEASE=45
+PNGLIB_RELEASE=46
 
 dnl End of version number stuff
 
diff --git a/libpng-1.2.45.txt b/libpng-1.2.46rc01.txt
similarity index 99%
rename from libpng-1.2.45.txt
rename to libpng-1.2.46rc01.txt
index 29adfcf5..e9f0c3b5 100644
--- a/libpng-1.2.45.txt
+++ b/libpng-1.2.46rc01.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.45 - July 7, 2011
+ libpng version 1.2.46rc01 - July 8, 2011
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.2.45 - July 7, 2011
+ libpng versions 0.97, January 1998, through 1.2.46rc01 - July 8, 2011
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
@@ -878,7 +878,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.2.45, not all possible expansions are supported.
+As of libpng version 1.2.46rc01, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -3179,13 +3179,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 XIII. Y2K Compliance in libpng
 
-July 7, 2011
+July 8, 2011
 
 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 1.2.45 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.46rc01 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 4d983437..cd624c14 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "July 7, 2011"
+.TH LIBPNG 3 "July 8, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.45
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.46rc01
 .SH SYNOPSIS
 \fI\fB
 
@@ -821,7 +821,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.45 - July 7, 2011
+ libpng version 1.2.46rc01 - July 8, 2011
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
@@ -832,7 +832,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.2.45 - July 7, 2011
+ libpng versions 0.97, January 1998, through 1.2.46rc01 - July 8, 2011
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
@@ -1699,7 +1699,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.2.45, not all possible expansions are supported.
+As of libpng version 1.2.46rc01, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -4000,13 +4000,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XIII. Y2K Compliance in libpng
 
-July 7, 2011
+July 8, 2011
 
 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 1.2.45 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.46rc01 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
@@ -4312,6 +4312,7 @@ the first widely used release:
  1.2.45rc01          13    10245  12.so.0.45[.0]
  1.0.55              10    10055  10.so.0.55[.0]
  1.2.45              13    10245  12.so.0.45[.0]
+ 1.2.46rc01          13    10246  12.so.0.46[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -4367,7 +4368,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.2.45 - July 7, 2011:
+Libpng version 1.2.46rc01 - July 8, 2011:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -4390,7 +4391,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.45, July 7, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.46rc01, July 8, 2011, are
 Copyright (c) 2004,2006-2008 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
@@ -4489,7 +4490,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-July 7, 2011
+July 8, 2011
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index 3737578b..eb58fc98 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "July 7, 2011"
+.TH LIBPNGPF 3 "July 8, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.45
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.46rc01
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index 27fee039..e7ca83b0 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "July 7, 2011"
+.TH PNG 5 "July 8, 2011"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index babad71d..ddcdd720 100644
--- a/png.c
+++ b/png.c
@@ -17,7 +17,7 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_45 Your_png_h_is_not_version_1_2_45;
+typedef version_1_2_46rc01 Your_png_h_is_not_version_1_2_46rc01;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.
@@ -724,13 +724,13 @@ png_get_copyright(png_structp png_ptr)
 #else
 #ifdef __STDC__
    return ((png_charp) PNG_STRING_NEWLINE \
-     "libpng version 1.2.45 - July 7, 2011" PNG_STRING_NEWLINE \
+     "libpng version 1.2.46rc01 - July 8, 2011" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2010 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE);
 #else
-      return ((png_charp) "libpng version 1.2.45 - July 7, 2011\
+      return ((png_charp) "libpng version 1.2.46rc01 - July 8, 2011\
       Copyright (c) 1998-2010 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.");
diff --git a/png.h b/png.h
index 29dc52b4..fb6d9fb1 100644
--- a/png.h
+++ b/png.h
@@ -1,6 +1,6 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.45 - July 7, 2011
+ * libpng version 1.2.46rc01 - July 8, 2011
  * Copyright (c) 1998-2011 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.)
@@ -10,7 +10,7 @@
  * 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 1.2.45 - July 7, 2011: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.46rc01 - July 8, 2011: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -267,6 +267,7 @@
  *    1.2.45rc01              13    10245  12.so.0.45[.0]
  *    1.0.55                  13    10055  10.so.0.55[.0]
  *    1.2.45                  13    10245  12.so.0.45[.0]
+ *    1.2.46rc01              13    10246  12.so.0.46[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -298,7 +299,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.45, July 7, 2011, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.46rc01, July 8, 2011, are
  * Copyright (c) 2004, 2006-2010 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:
@@ -410,13 +411,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    July 7, 2011
+ *    July 8, 2011
  *
  *    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 1.2.45 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.46rc01 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
@@ -472,9 +473,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.45"
+#define PNG_LIBPNG_VER_STRING "1.2.46rc01"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.45 - July 7, 2011\n"
+   " libpng version 1.2.46rc01 - July 8, 2011\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -482,12 +483,12 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 45
+#define PNG_LIBPNG_VER_RELEASE 46
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  0
+#define PNG_LIBPNG_VER_BUILD  01
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -504,7 +505,7 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
+#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.
@@ -512,7 +513,7 @@
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
  */
-#define PNG_LIBPNG_VER 10245 /* 1.2.45 */
+#define PNG_LIBPNG_VER 10246 /* 1.2.46 */
 
 #ifndef PNG_VERSION_INFO_ONLY
 /* Include the compression library's header */
@@ -1552,7 +1553,7 @@ struct png_struct_def
 /* 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_45;
+typedef png_structp version_1_2_46rc01;
 
 typedef png_struct FAR * FAR * png_structpp;
 
diff --git a/pngconf.h b/pngconf.h
index 69282416..5bde93c2 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.45 - July 7, 2011
+ * libpng version 1.2.46rc01 - July 8, 2011
  * Copyright (c) 1998-2011 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.)
diff --git a/pngtest.c b/pngtest.c
index aeb60df1..fb6df182 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1702,4 +1702,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_45 your_png_h_is_not_version_1_2_45;
+typedef version_1_2_46rc01 your_png_h_is_not_version_1_2_46rc01;
diff --git a/projects/wince.txt b/projects/wince.txt
index 00fd5829..fe83843a 100644
--- a/projects/wince.txt
+++ b/projects/wince.txt
@@ -1,6 +1,6 @@
 A set of project files is available for WinCE.  Get
-libpng-1.2.45-project-wince.zip from a libpng distribution
+libpng-1.2.46rc01-project-wince.zip from a libpng distribution
 site such as http://libpng.sourceforge.net/index.html
 
 Put the zip file in this directory (projects) and then run
-"unzip -a libpng-1.2.45-project-wince.zip"
+"unzip -a libpng-1.2.46rc01-project-wince.zip"
diff --git a/projects/xcode/libpng.xcodeproj/project.pbxproj b/projects/xcode/libpng.xcodeproj/project.pbxproj
index 16b08159..2c0870ee 100644
--- a/projects/xcode/libpng.xcodeproj/project.pbxproj
+++ b/projects/xcode/libpng.xcodeproj/project.pbxproj
@@ -222,7 +222,7 @@
 				COPY_PHASE_STRIP = NO;
 				DYLIB_COMPATIBILITY_VERSION = 3;
 				DYLIB_CURRENT_VERSION = 3;
-				FRAMEWORK_VERSION = 1.2.45;
+				FRAMEWORK_VERSION = 1.2.46rc01;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
@@ -240,7 +240,7 @@
 			buildSettings = {
 				DYLIB_COMPATIBILITY_VERSION = 3;
 				DYLIB_CURRENT_VERSION = 3;
-				FRAMEWORK_VERSION = 1.2.45;
+				FRAMEWORK_VERSION = 1.2.46rc01;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
diff --git a/scripts/README.txt b/scripts/README.txt
index 35e651ac..32f07ff6 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,8 +1,8 @@
 
-Makefiles for  libpng version 1.2.45 - July 7, 2011
+Makefiles for  libpng version 1.2.46rc01 - July 8, 2011
 
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.45)
+                       (gcc, creates libpng12.so.0.1.2.46rc01)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -20,7 +20,7 @@ Makefiles for  libpng version 1.2.45 - July 7, 2011
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng12.so.0.1.2.45)
+                       gcc, creates libpng12.so.0.1.2.46rc01)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.gccmmx   =>  Generic gcc makefile previously using MMX code
@@ -38,14 +38,14 @@ Makefiles for  libpng version 1.2.45 - July 7, 2011
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.45)
+                       creates libpng12.so.0.1.2.46rc01)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.45)
+                       creates libpng12.so.0.1.2.46rc01)
  makefile.solaris-x86  =>  Solaris 2.X makefile (gcc, no MMX code,
-                       creates libpng12.so.0.1.2.45)
+                       creates libpng12.so.0.1.2.46rc01)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.45)
+                       creates libpng12.so.0.1.2.46rc01)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 429d48fb..901d2ad6 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.2.45
+version=1.2.46rc01
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 5ce82e00..7b521203 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng12
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.45
+Version: 1.2.46rc01
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index e62c07ff..100ecf2a 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index 47201234..09a53f17 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index b3616106..abe18ba1 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -23,7 +23,7 @@ LN_SF = ln -f -s
 
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 9df01211..1b541633 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.cegcc b/scripts/makefile.cegcc
index 191ef476..6e9cd750 100644
--- a/scripts/makefile.cegcc
+++ b/scripts/makefile.cegcc
@@ -23,7 +23,7 @@
 
 VERMAJ = 1
 VERMIN = 2
-VERMIC = 45
+VERMIC = 46
 VER = $(VERMAJ).$(VERMIN).$(VERMIC)
 NAME = libpng
 PACKAGE = $(NAME)-$(VER)
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index 5596e94d..ab422a6c 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -77,7 +77,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index 64d28308..463652da 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -22,7 +22,7 @@ ZLIBINC=../zlib
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 12
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 2cfea2d2..8dc7656b 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -8,7 +8,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 0fbef007..a2b0c6ad 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -16,7 +16,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index 6b655bee..7092dca6 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -17,7 +17,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index 70470b02..196b1ec0 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -21,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index 6181f4d6..ad8d1ad5 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 1bacdbbd..d842f2d1 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -21,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 805b888f..b7089cc9 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 070ae293..a18629c3 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -81,7 +81,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 MINGDLL = 12
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index c4a78b8b..f74ce90e 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng12
 
 LIB=	png12
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.45
+SHLIB_MINOR=	1.2.46rc01
 SRCS=	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 17849b86..e47dac79 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.2.45
+SHLIB_MINOR=	1.2.46rc01
 SRCS=	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 cc6f65be..7cb7c96a 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index 28965c97..c87dbdd5 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.45
+SHLIB_MINOR=	1.2.46rc01
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 8708135b..04ce8464 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -12,7 +12,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index e7adeacb..9ad0d7ec 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index c990fd24..69249d68 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index f0b23bd1..cfa900f6 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -11,7 +11,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index 635b0d68..d866226d 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.solaris-x86 b/scripts/makefile.solaris-x86
index 98c8f114..c5a4c176 100644
--- a/scripts/makefile.solaris-x86
+++ b/scripts/makefile.solaris-x86
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.45
+PNGMIN = 1.2.46rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/png32ce.def b/scripts/png32ce.def
index b59bcf35..68085654 100644
--- a/scripts/png32ce.def
+++ b/scripts/png32ce.def
@@ -5,7 +5,7 @@
 LIBRARY lpngce
 
 EXPORTS
-;Version 1.2.45
+;Version 1.2.46rc01
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index e524b01a..b754eed4 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.2.45
+; Version 1.2.46rc01
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngw32.def b/scripts/pngw32.def
index 052a15aa..910a0ce3 100644
--- a/scripts/pngw32.def
+++ b/scripts/pngw32.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.2.45
+;Version 1.2.46rc01
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3