diff --git a/ANNOUNCE b/ANNOUNCE
index 2058b3d..3211de3 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.22beta3 - October 6, 2007
+Libpng 1.2.22beta4 - October 7, 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-1.2.22beta3.tar.gz
-   libpng-1.2.22beta3.tar.bz2
+   libpng-1.2.22beta4.tar.gz
+   libpng-1.2.22beta4.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.2.22beta3-no-config.tar.gz
-   libpng-1.2.22beta3-no-config.tar.bz2
+   libpng-1.2.22beta4-no-config.tar.gz
+   libpng-1.2.22beta4-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1222b03.zip
-   lp1222b03.tar.bz2
+   lp1222b04.zip
+   lp1222b04.tar.bz2
 
 Project files
 
-   libpng-1.2.22beta3-project-netware.zip
-   libpng-1.2.22beta3-project-wince.zip
+   libpng-1.2.22beta4-project-netware.zip
+   libpng-1.2.22beta4-project-wince.zip
 
 Other information:
 
-   libpng-1.2.22beta3-README.txt
-   libpng-1.2.22beta3-KNOWNBUGS.txt
-   libpng-1.2.22beta3-LICENSE.txt
-   libpng-1.2.22beta3-Y2K-compliance.txt
+   libpng-1.2.22beta4-README.txt
+   libpng-1.2.22beta4-KNOWNBUGS.txt
+   libpng-1.2.22beta4-LICENSE.txt
+   libpng-1.2.22beta4-Y2K-compliance.txt
 
 Changes since the last public release (1.2.19):
 
@@ -62,7 +62,7 @@
   Revised #ifdefs to ensure one and only one of pnggccrd.c, pngvcrd.c,
     or part of pngrutil.c is selected.
 
-version 1.2.20rc3 [October 6, 2007]
+version 1.2.20rc3 [October 7, 2007]
   Remove a little more code in pngwutil.c when PNG_NO_WRITE_FILTER is selected.
   Added /D _CRT_SECURE_NO_WARNINGS to visual6c and visualc71 projects.
   Compile png_mmx_support() in png.c even when PNG_NO_MMX_CODE is defined.
@@ -120,6 +120,9 @@
 version 1.2.22beta3 [October 6, 2007]
   Fix two off-by-one terminating NULL after png_strncpy().
 
+version 1.2.22beta4 [October 7, 2007]
+  Changed some 0 to '\0'.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 
 (subscription required; visit 
diff --git a/CHANGES b/CHANGES
index a090384..45bb31f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1977,6 +1977,9 @@
 version 1.2.22beta3 [October 6, 2007]
   Fix two off-by-one terminating NULL after png_strncpy().
 
+version 1.2.22beta4 [October 7, 2007]
+  Changed some 0 to '\0'.
+
 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 d3726fb..2073d8b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.2.22beta3 - October 6, 2007
+Installing libpng version 1.2.22beta4 - October 7, 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-1.2.22beta3" or "lpng109" and "zlib-1.2.1"
+might be called "libpng-1.2.22beta4" 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:
@@ -101,9 +101,9 @@
  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.0.1.2.22beta3)
+                       gcc, creates libpng12.so.0.1.2.22beta4)
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.22beta3)
+                       (gcc, creates libpng12.so.0.1.2.22beta4)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -125,14 +125,14 @@
  makefile.openbsd  =>  OpenBSD makefile
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.22beta3)
+                       creates libpng12.so.0.1.2.22beta4)
  makefile.sunos    =>  Sun makefile
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.22beta3)
+                       creates libpng12.so.0.1.2.22beta4)
  makefile.solaris-x86 =>  Solaris/intelMMX 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.22beta3)
+                       creates libpng12.so.0.1.2.22beta4)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.22beta3)
+                       creates libpng12.so.0.1.2.22beta4)
  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 69f6247..7725e1c 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.2.22beta3
+Known bugs in libpng version 1.2.22beta4
 
 1. February 23, 2006: The custom makefiles don't build libpng with -lz.
 
diff --git a/LICENSE b/LICENSE
index 03ff9a4..b8df809 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 1.2.22beta3, October 6, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.22beta4, October 7, 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
-October 6, 2007
+October 7, 2007
diff --git a/README b/README
index 3bc8def..06724ff 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.2.22beta3 - October 6, 2007 (shared library 12.0)
+README for libpng version 1.2.22beta4 - October 7, 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.0.1.2.22beta3)
+                            gcc, creates libpng12.so.0.1.2.22beta4)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.22beta3)
+                            (gcc, creates libpng12.so.0.1.2.22beta4)
        makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.22beta3,
+                            (gcc, creates libpng12.so.0.1.2.22beta4,
                             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.0.1.2.22beta3)
+                            (gcc, creates libpng12.so.0.1.2.22beta4)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.22beta3)
+                            (gcc, creates libpng12.so.0.1.2.22beta4)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.22beta3)
+                            (gcc, creates libpng12.so.0.1.2.22beta4)
        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 244e504..bfe07b5 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      October 6, 2007
+      October 7, 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 1.2.22beta3 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.22beta4 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 18e3418..37c3364 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 1.2.22beta3.
+# Generated by GNU Autoconf 2.61 for libpng 1.2.22beta4.
 #
 # 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='1.2.22beta3'
-PACKAGE_STRING='libpng 1.2.22beta3'
+PACKAGE_VERSION='1.2.22beta4'
+PACKAGE_STRING='libpng 1.2.22beta4'
 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 1.2.22beta3 to adapt to many kinds of systems.
+\`configure' configures libpng 1.2.22beta4 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 1.2.22beta3:";;
+     short | recursive ) echo "Configuration of libpng 1.2.22beta4:";;
    esac
   cat <<\_ACEOF
 
@@ -1585,7 +1585,7 @@
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.2.22beta3
+libpng configure 1.2.22beta4
 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 1.2.22beta3, which was
+It was created by libpng $as_me 1.2.22beta4, 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='1.2.22beta3'
+ VERSION='1.2.22beta4'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2440,7 +2440,7 @@
 
 
 
-PNGLIB_VERSION=1.2.22beta3
+PNGLIB_VERSION=1.2.22beta4
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=22
@@ -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 1.2.22beta3, which was
+This file was extended by libpng $as_me 1.2.22beta4, 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 1.2.22beta3
+libpng config.status 1.2.22beta4
 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 f4774da..f9df219 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,12 +18,12 @@
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.2.22beta3], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.22beta4], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.2.22beta3
+PNGLIB_VERSION=1.2.22beta4
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=22
diff --git a/libpng-1.2.22beta3.txt b/libpng-1.2.22beta4.txt
similarity index 99%
rename from libpng-1.2.22beta3.txt
rename to libpng-1.2.22beta4.txt
index f87e7a2..4915abc 100644
--- a/libpng-1.2.22beta3.txt
+++ b/libpng-1.2.22beta4.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.22beta3 - October 6, 2007
+ libpng version 1.2.22beta4 - October 7, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2007 Glenn Randers-Pehrson
@@ -2796,13 +2796,13 @@
 
 IX. Y2K Compliance in libpng
 
-October 6, 2007
+October 7, 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 1.2.22beta3 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.22beta4 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 17b187e..26c8761 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "October 6, 2007"
+.TH LIBPNG 3 "October 7, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.22beta3
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.22beta4
 .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 1.2.22beta3 - October 6, 2007
+ libpng version 1.2.22beta4 - October 7, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2007 Glenn Randers-Pehrson
@@ -3206,13 +3206,13 @@
 
 .SH IX. Y2K Compliance in libpng
 
-October 6, 2007
+October 7, 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 1.2.22beta3 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.22beta4 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
@@ -3415,7 +3415,7 @@
  1.2.21rc1-3         13    10221  12.so.0.21[.0]
  1.0.29              10    10029  10.so.0.29[.0]
  1.2.21              13    10221  12.so.0.21[.0]
- 1.2.22beta1-3       13    10222  12.so.0.22[.0]
+ 1.2.22beta1-4       13    10222  12.so.0.22[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3471,7 +3471,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.2.22beta3 - October 6, 2007:
+Libpng version 1.2.22beta4 - October 7, 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).
 
@@ -3492,7 +3492,7 @@
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.22beta3, October 6, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.22beta4, October 7, 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
@@ -3591,7 +3591,7 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-October 6, 2007
+October 7, 2007
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index ef075c3..26a1918 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "October 6, 2007"
+.TH LIBPNGPF 3 "October 7, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.22beta3
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.22beta4
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index 60c1546..2a26cfb 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "October 6, 2007"
+.TH PNG 5 "October 7, 2007"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index 0ad1f23..7606c80 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_22beta3 Your_png_h_is_not_version_1_2_22beta3;
+typedef version_1_2_22beta4 Your_png_h_is_not_version_1_2_22beta4;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
@@ -693,7 +693,7 @@
 png_get_copyright(png_structp png_ptr)
 {
    png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.2.22beta3 - October 6, 2007\n\
+   return ((png_charp) "\n libpng version 1.2.22beta4 - October 7, 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 9d374b8..f111f48 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.22beta3 - October 6, 2007
+ * libpng version 1.2.22beta4 - October 7, 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 1.2.22beta3 - October 6, 2007: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.22beta4 - October 7, 2007: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -164,7 +164,7 @@
  *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
  *    1.0.29                  10    10029  10.so.0.29[.0]
  *    1.2.21                  13    10221  12.so.0.21[.0]
- *    1.2.22beta1-3           13    10222  12.so.0.22[.0]
+ *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -194,7 +194,7 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.22beta3, October 6, 2007, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.22beta4, October 7, 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:
@@ -306,13 +306,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    October 6, 2007
+ *    October 7, 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 1.2.22beta3 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.22beta4 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
@@ -368,9 +368,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.22beta3"
+#define PNG_LIBPNG_VER_STRING "1.2.22beta4"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.22beta3 - October 6, 2007\n"
+   " libpng version 1.2.22beta4 - October 7, 2007\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -382,7 +382,7 @@
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
 
-#define PNG_LIBPNG_VER_BUILD  3
+#define PNG_LIBPNG_VER_BUILD  4
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -1417,7 +1417,7 @@
 /* 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_22beta3;
+typedef png_structp version_1_2_22beta4;
 
 typedef png_struct FAR * FAR * png_structpp;
 
diff --git a/pngconf.h b/pngconf.h
index 86a4936..3030743 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.22beta3 - October 6, 2007
+ * libpng version 1.2.22beta4 - October 7, 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/pngerror.c b/pngerror.c
index 3a8c922..b3cfe46 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 September 7, 2007
+ * Last changed in libpng 1.2.22 [October 7, 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)
@@ -160,13 +160,13 @@
    }
 
    if (error_message == NULL)
-      buffer[iout] = 0;
+      buffer[iout] = '\0';
    else
    {
       buffer[iout++] = ':';
       buffer[iout++] = ' ';
       png_strncpy(buffer+iout, error_message, 63);
-      buffer[iout+63] = 0;
+      buffer[iout+63] = '\0';
    }
 }
 
diff --git a/pngpread.c b/pngpread.c
index edc9202..81a9fd1 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.21 October 4, 2007
+ * Last changed in libpng 1.2.22 [October 7, 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)
@@ -1492,7 +1492,7 @@
 #endif
       png_strncpy((png_charp)png_ptr->unknown_chunk.name,
 	 (png_charp)png_ptr->chunk_name, 4);
-      png_ptr->chunk_name[4]=0;
+      png_ptr->unknown_chunk.name[4] = '\0';
       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);
diff --git a/pngrtran.c b/pngrtran.c
index 5f497dc..76db0cc 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.2.22 [October 6, 2007]
+ * Last changed in libpng 1.2.22 [October 7, 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/pngrutil.c b/pngrutil.c
index 2427a29..835cd1b 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.2.21 October 4, 2007
+ * Last changed in libpng 1.2.22 [October 7, 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)
@@ -2225,7 +2225,7 @@
 #endif
        png_strncpy((png_charp)png_ptr->unknown_chunk.name,
 	 (png_charp)png_ptr->chunk_name, 4);
-       png_ptr->unknown_chunk.name[4]=0;
+       png_ptr->unknown_chunk.name[4] = '\0';
        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);
diff --git a/pngset.c b/pngset.c
index 9dffed4..dc6b4e3 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.2.21 [October 6, 2007]
+ * Last changed in libpng 1.2.22 [October 7, 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)
@@ -691,7 +691,7 @@
       return;
    }
    png_strncpy(new_iccp_name, name, png_strlen(name));
-   new_iccp_name[png_strlen(name)]=0;
+   new_iccp_name[png_strlen(name)] = '\0';
    new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
    if (new_iccp_profile == NULL)
    {
@@ -982,7 +982,7 @@
         }
         /* TODO: use png_malloc_warn */
         png_strncpy(to->name, from->name, png_strlen(from->name));
-        to->name[png_strlen(from->name)]=0;
+        to->name[png_strlen(from->name)] = '\0';
         to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
             from->nentries * png_sizeof(png_sPLT_entry));
         /* TODO: use png_malloc_warn */
@@ -1040,7 +1040,7 @@
         png_unknown_chunkp from = unknowns + i;
 
         png_strncpy((png_charp)to->name, (png_charp)from->name, 4);
-        to->name[4]=0;
+        to->name[4] = '\0';
         to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
         if (to->data == NULL)
         {
diff --git a/pngtest.c b/pngtest.c
index d2e7bf3..bf04a90 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,7 +1,7 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * Last changed in libpng 1.2.6 - August 15, 2004
+ * Last changed in libpng 1.2.22 - [October 7, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2004 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -1007,7 +1007,7 @@
             we use it */
          png_strncpy(tIME_string,png_convert_to_rfc1123(read_ptr,
             mod_time),29);
-         tIME_string[29]=0;
+         tIME_string[29] = '\0';
          tIME_chunk_present++;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
       }
@@ -1149,7 +1149,7 @@
             we use it */
          png_strncpy(tIME_string,png_convert_to_rfc1123(read_ptr,
             mod_time),29);
-         tIME_string[29]=0;
+         tIME_string[29] = '\0';
          tIME_chunk_present++;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
       }
@@ -1550,4 +1550,4 @@
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_22beta3 your_png_h_is_not_version_1_2_22beta3;
+typedef version_1_2_22beta4 your_png_h_is_not_version_1_2_22beta4;
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index b2af2dc..7e05e34 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -169,7 +169,7 @@
 
 # SET UP LINKS
 set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#    VERSION 0.${PNGLIB_RELEASE}.1.2.22beta3
+#    VERSION 0.${PNGLIB_RELEASE}.1.2.22beta4
      VERSION 0.${PNGLIB_RELEASE}.0
      SOVERSION 0
      CLEAN_DIRECT_OUTPUT 1)
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index a83aa2f..86e3975 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -8,7 +8,7 @@
 
 # Modeled after libxml-config.
 
-version=1.2.22beta3
+version=1.2.22beta4
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc-configure.in b/scripts/libpng.pc-configure.in
index eb53f8d..888853b 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: 1.2.22beta3
+Version: 1.2.22beta4
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir} @LIBPNG_NO_MMX@
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 760377e..df3bfdb 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.22beta3
+Version: 1.2.22beta4
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index 5ec621e..6eede99 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index 8498dd5..693d41d 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index 22958dd..6750b47 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -20,7 +20,7 @@
 
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 8045362..95c8ea5 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index e2efcf7..97bf04d 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -74,7 +74,7 @@
 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index 36c4eb4..4e14365 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -19,7 +19,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 0642500..74d18e1 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -5,7 +5,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index ad90267..7cc4a00 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -12,7 +12,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index acd03e9..293457a 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -14,7 +14,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index 0e74f4a..fd9f47d 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -18,7 +18,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index 67f574c..77d6fe3 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 28a82d5..1e6b021 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -18,7 +18,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index bc0d96f..bb1877a 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 189d8a3..e3619fb 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -74,7 +74,7 @@
 LIBNAME = libpng12
 PNGMAJ = 0
 MINGDLL = 12
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 08a02e6..c1a2227 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -14,7 +14,7 @@
 
 LIB=	png12
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.22beta3
+SHLIB_MINOR=	1.2.22beta4
 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 531e6f3..90f6bcc 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -14,7 +14,7 @@
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.2.22beta3
+SHLIB_MINOR=	1.2.22beta4
 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 8dd98a5..a8b679b 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -7,7 +7,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index f40e00b..7f817e0 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -8,7 +8,7 @@
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.22beta3
+SHLIB_MINOR=	1.2.22beta4
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index ee7a534..41dc3cc 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index 9ef1b6c..608b2e0 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index 3e204aa..42965ad 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index e05e110..d00e63a 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -8,7 +8,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index 588ea45..20327de 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.solaris-x86 b/scripts/makefile.solaris-x86
index fb085d6..0b272aa 100644
--- a/scripts/makefile.solaris-x86
+++ b/scripts/makefile.solaris-x86
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.22beta3
+PNGMIN = 1.2.22beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index b60b9aa..a460521 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.2.22beta3
+; Version 1.2.22beta4
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngw32.def b/scripts/pngw32.def
index 8a3508d..0188f05 100644
--- a/scripts/pngw32.def
+++ b/scripts/pngw32.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.2.22beta3
+;Version 1.2.22beta4
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3