diff -ru4NwbB libpng-1.4.1/configure.ac libpng-1.4.2beta01/configure.ac
--- libpng-1.4.1/configure.ac	2010-02-25 05:38:36.634441039 -0600
+++ libpng-1.4.2beta01/configure.ac	2010-04-01 07:39:27.732310570 -0500
@@ -23,9 +23,9 @@
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
 PNGLIB_VERSION=1.4.2beta01
-PNGLIB_MAJOR=%RELEASE%
+PNGLIB_MAJOR=1
 PNGLIB_MINOR=4
 PNGLIB_RELEASE=%RELEASE%
 
 dnl End of version number stuff
diff -ru4NwbB libpng-1.4.1/png.h libpng-1.4.2beta01/png.h
--- libpng-1.4.1/png.h	2010-02-25 05:38:30.147965500 -0600
+++ libpng-1.4.2beta01/png.h	2010-04-01 07:39:21.723840162 -0500
@@ -138,8 +138,9 @@
  *    1.4.1rc01               14    10401  14.so.14.1[.0]
  *    1.4.1beta04-12          14    10401  14.so.14.1[.0]
  *    1.4.1rc02-04            14    10401  14.so.14.1[.0]
  *    1.4.1                   14    10401  14.so.14.1[.0]
+ *    1.4.2beta01             14    10402  14.so.14.2[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
  *    used for changes in backward compatibility, as it is intended.  The
@@ -1494,8 +1495,13 @@
  */
 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
    png_size_t num_to_check));
 
+/* Simple signature checking function.  This is the same as calling
+ * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
+ */
+#define png_check_sig(sig,n) !png_sig_cmp((sig), 0, (n))
+
 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
 extern PNG_EXPORT(png_structp,png_create_read_struct)
    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
diff -ru4NwbB libpng-1.4.1/pngrutil.c libpng-1.4.2beta01/pngrutil.c
--- libpng-1.4.1/pngrutil.c	2010-02-25 05:38:30.252231541 -0600
+++ libpng-1.4.2beta01/pngrutil.c	2010-04-01 07:39:21.826118684 -0500
@@ -1,8 +1,8 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.4.1 [April 1, 2010]
+ * Last changed in libpng 1.4.2 [April 1, 2010]
  * Copyright (c) 1998-2010 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.)
  *
@@ -333,9 +333,13 @@
        * has already been output (warning) or the size really is zero
        * and we have nothing to do - the code will exit through the
        * error case below.
        */
-      else if (expanded_size > 0)
+#if defined(PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED) || \
+    defined(PNG_USER_CHUNK_MALLOC_MAX)
+      else
+#endif
+      if (expanded_size > 0)
       {
          /* Success (maybe) - really uncompress the chunk. */
 	 png_size_t new_size = 0;
 	 png_charp text = png_malloc_warn(png_ptr,
diff -ru4NwbB libpng-1.4.1/projects/xcode/libpng.xcodeproj/project.pbxproj libpng-1.4.2beta01/projects/xcode/libpng.xcodeproj/project.pbxproj
--- libpng-1.4.1/projects/xcode/libpng.xcodeproj/project.pbxproj	2010-02-25 05:38:31.620976336 -0600
+++ libpng-1.4.2beta01/projects/xcode/libpng.xcodeproj/project.pbxproj	2010-04-01 07:39:22.984856293 -0500
@@ -225,9 +225,9 @@
 			buildSettings = {
 				COPY_PHASE_STRIP = NO;
 				DYLIB_COMPATIBILITY_VERSION = 14;
 				DYLIB_CURRENT_VERSION = 14;
-				FRAMEWORK_VERSION = 1.4.1;
+				FRAMEWORK_VERSION = 1.4.2beta01;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "@executable_path/../Frameworks";
@@ -243,9 +243,9 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				DYLIB_COMPATIBILITY_VERSION = 14;
 				DYLIB_CURRENT_VERSION = 14;
-				FRAMEWORK_VERSION = 1.4.1;
+				FRAMEWORK_VERSION = 1.4.2beta01;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "@executable_path/../Frameworks";