diff -ru4NwbB libpng-1.2.45/Makefile.am libpng-1.2.46rc01/Makefile.am
--- libpng-1.2.45/Makefile.am	2011-07-07 06:53:51.347766499 -0500
+++ libpng-1.2.46rc01/Makefile.am	2011-07-08 06:49:29.799934472 -0500
@@ -101,10 +101,9 @@
 	cp 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[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
 			>$@.new
diff -ru4NwbB libpng-1.2.45/png.h libpng-1.2.46rc01/png.h
--- libpng-1.2.45/png.h	2011-07-07 06:53:37.095765499 -0500
+++ libpng-1.2.46rc01/png.h	2011-07-08 06:49:16.029492760 -0500
@@ -266,8 +266,9 @@
  *    1.0.55rc01              13    10055  10.so.0.55[.0]
  *    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
  *    used for changes in backward compatibility, as it is intended.  The
diff -ru4NwbB libpng-1.2.45/projects/xcode/libpng.xcodeproj/project.pbxproj libpng-1.2.46rc01/projects/xcode/libpng.xcodeproj/project.pbxproj
--- libpng-1.2.45/projects/xcode/libpng.xcodeproj/project.pbxproj	2011-07-07 06:53:38.613174824 -0500
+++ libpng-1.2.46rc01/projects/xcode/libpng.xcodeproj/project.pbxproj	2011-07-08 06:49:17.305599492 -0500
@@ -221,9 +221,9 @@
 			buildSettings = {
 				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;
 				INSTALL_PATH = "@executable_path/../Frameworks";
@@ -239,9 +239,9 @@
 			isa = XCBuildConfiguration;
 			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;
 				INSTALL_PATH = "@executable_path/../Frameworks";