diff --git a/ANNOUNCE b/ANNOUNCE
index 976c293e5f29da75b59c92a674a0cdb564e82216..17aba3886e8ea30fad3eb73149413b40b654e3d2 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -167,12 +167,6 @@ version 1.2.41rc01 and 1.0.51rc01 [November 18, 2009]
 version 1.2.41rc02 [November 22, 2009]
   Rebuilt the configure scripts with autoconf-2.65
 
-version 1.2.41rc03 [November 25, 2009]
-  Disabled the new pedantic warnings about deprecated function use and
-    deprecated structure access unless the user defines PNG_PEDANTIC_WARNINGS.
-  Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
-  Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
-
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 8611727096ad0cbad5469fd9d203c310d17eae93..a30803a6afbad2e49032d2a6b338bef159113efb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2595,12 +2595,6 @@ version 1.2.41rc01 and 1.0.51rc01 [November 18, 2009]
 version 1.2.41rc02 [November 22, 2009]
   Rebuilt the configure scripts with autoconf-2.65
 
-version 1.2.41rc03 [November 25, 2009]
-  Disabled the new pedantic warnings about deprecated function use and
-    deprecated structure access unless the user defines PNG_PEDANTIC_WARNINGS.
-  Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
-  Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
-
 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/png.c b/png.c
index 5be01ffe5b854efdd52d9cc9df9c1802d0ca755b..28e04bae236e02f4f981fa4af8010421e9672e44 100644
--- a/png.c
+++ b/png.c
@@ -13,7 +13,6 @@
 
 #define PNG_INTERNAL
 #define PNG_NO_EXTERN
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
diff --git a/pngconf.h b/pngconf.h
index c4c4ffaa756edecb2eed046f0a75f7380a3773d9..62eb0e8876937ce12e2a7fbaf4e79a2c5e11d213 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1522,29 +1522,23 @@ typedef z_stream FAR *  png_zstreamp;
 #  endif
 #endif
 
-#ifdef PNG_PEDANTIC_WARNINGS
-#  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
-#    define PNG_PEDANTIC_WARNINGS_SUPPORTED
-#  endif
-#endif
-
-#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
 /* Support for compiler specific function attributes.  These are used
  * so that where compiler support is available incorrect use of API
  * functions in png.h will generate compiler warnings.  Added at libpng
  * version 1.2.41.
  */
-#  ifdef __GNUC__
-#    ifndef PNG_USE_RESULT
-#      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
-#    endif
-#    ifndef PNG_NORETURN
-#      define PNG_NORETURN   __attribute__((__noreturn__))
-#    endif
-#    ifndef PNG_ALLOCATED
-#      define PNG_ALLOCATED  __attribute__((__malloc__))
-#    endif
+#ifdef __GNUC__
+#  ifndef PNG_USE_RESULT
+#    define PNG_USE_RESULT __attribute__((__warn_unused_result__))
+#  endif
+#  ifndef PNG_NORETURN
+#    define PNG_NORETURN   __attribute__((__noreturn__))
+#  endif
+#  ifndef PNG_ALLOCATED
+#    define PNG_ALLOCATED  __attribute__((__malloc__))
+#  endif
 
+#  ifndef PNG_CONFIGURE_LIBPNG
     /* This specifically protects structure members that should only be
      * accessed from within the library, therefore should be empty during
      * a library build.
@@ -1556,16 +1550,16 @@ typedef z_stream FAR *  png_zstreamp;
 #      define PNG_DEPSTRUCT  __attribute__((__deprecated__))
 #    endif
 #    ifndef PNG_PRIVATE
-#      if 0 /* Doesn't work so we use deprecated instead*/
-#        define PNG_PRIVATE \
-          __attribute__((warning("This function is not exported by libpng.")))
-#      else
-#        define PNG_PRIVATE \
-          __attribute__((__deprecated__))
-#      endif
-#    endif /* PNG_PRIVATE */
-#  endif /* __GNUC__ */
-#endif /* PNG_PEDANTIC_WARNINGS */
+#if 0 /* Doesn't work so we use deprecated instead*/
+#      define PNG_PRIVATE \
+        __attribute__((warning("This function is not exported by libpng.")))
+#else
+#      define PNG_PRIVATE \
+        __attribute__((__deprecated__))
+#endif
+#    endif
+#  endif
+#endif
 
 #ifndef PNG_DEPRECATED
 #  define PNG_DEPRECATED  /* Use of this function is deprecated */
diff --git a/pngerror.c b/pngerror.c
index 2cbf5e09cbd70986403934b17b328f1139fcd716..1d72dbff77b44c1a59f2ed6d901d30f63e2abf61 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -17,7 +17,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngget.c b/pngget.c
index 46d4f70c2548f7d7ac7dfcd713173dda4237fa83..e8c4d367c26d5cc431a2da66994c4fd8fc8b3fec 100644
--- a/pngget.c
+++ b/pngget.c
@@ -13,7 +13,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngmem.c b/pngmem.c
index ba301c681e599a95e94537911dc5b11732e2fe42..1a0a5b589c3ba7503177e546ddcf036cffdd4597 100644
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,7 +1,7 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * Last changed in libpng 1.2.41 [November 25, 2009]
+ * Last changed in libpng 1.2.37 [June 4, 2009]
  * Copyright (c) 1998-2009 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.)
@@ -18,7 +18,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngpread.c b/pngpread.c
index 2d09ee26d367fd0a2fbe4d13f2e8889e07c6e936..239c04d8a38db16b35e2ee162138132cd47348ab 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.41 [November 25, 2009]
+ * Last changed in libpng 1.2.38 [July 16, 2009]
  * Copyright (c) 1998-2009 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.)
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 
diff --git a/pngread.c b/pngread.c
index 1272f4139a62771c6b1d2e677403f80ae7e6b4aa..f0f1fd99d4417d22dbef53c8a147d4ade7083765 100644
--- a/pngread.c
+++ b/pngread.c
@@ -15,7 +15,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngrio.c b/pngrio.c
index db379fb7d7fb51d1e596ff52f03117355a21d0ad..1a641a6f08a99221d9b2cb15a18d16ab893c42be 100644
--- a/pngrio.c
+++ b/pngrio.c
@@ -19,7 +19,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngrtran.c b/pngrtran.c
index 0925f131d3af798eb3c3488969fd3ac77c93a1da..56be15d6b89b5de87c10ca46930b39cb69f4b799 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -17,7 +17,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngrutil.c b/pngrutil.c
index 5a74048966d6cd6d06a4faf7e8e86780a6476ab1..3f41d1e5f11464ea097a4982180ec1ceeb4bb92f 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -15,7 +15,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_READ_SUPPORTED
 
diff --git a/pngset.c b/pngset.c
index 9dfc8164d358b4f5c324cf34955b0a9f14754b1e..9df57ee5942c883bf91975df04eece7a81d2296f 100644
--- a/pngset.c
+++ b/pngset.c
@@ -17,7 +17,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngtest.c b/pngtest.c
index 27a64d9192cfd88018d5fada05bc1c2298b66285..efca9aeb0cddd48bb5443fa7da86928d6b5a2f8d 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -31,7 +31,6 @@
  * of files at once by typing "pngtest -m file1.png file2.png ..."
  */
 
-#define PNG_PEDANTIC_WARNINGS
 #include "png.h"
 
 #ifdef _WIN32_WCE
diff --git a/pngtrans.c b/pngtrans.c
index aa01b4ca263912c2f7c65f0cca3c9044fbdb906a..4065d4dbcb175cb9e65ad5ee9d4025c93038f572 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
diff --git a/pngwio.c b/pngwio.c
index 87c1691482885c4e51e371f2a3a6928ce7f11c34..c70e0381a1dc3ecfcc6ba7d2ee21f0eede395a47 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -19,7 +19,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/pngwrite.c b/pngwrite.c
index 11f967b7b3a1533861462e86b93c626cf72b3a5f..e6b5da04080c0ca2da21958d1982a7451b5928ca 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -13,7 +13,6 @@
 
 /* Get internal access to png.h */
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/pngwtran.c b/pngwtran.c
index 1105d895acdbff29763000a77803a9a6ef3dda5e..82e6641cc1c9a1721521460b5f884702f7ea9fe5 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/pngwutil.c b/pngwutil.c
index e7e0a2dce1572e317e5cf694cb4ecdcc33e328f0..24916ecc2ca547aae19dde77ab394a85b2639f82 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -12,7 +12,6 @@
  */
 
 #define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 
diff --git a/projects/visualc6/libpng.dsp b/projects/visualc6/libpng.dsp
index 6f611f7d3aad18dd286ad49bd3bb63b1e70f0369..8bb5f1b3fffd48e971e6e649848717dd75c05c93 100644
--- a/projects/visualc6/libpng.dsp
+++ b/projects/visualc6/libpng.dsp
@@ -56,8 +56,8 @@ MTL=midl.exe
 # ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -87,8 +87,8 @@ MTL=midl.exe
 # ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG" /d PNG_DEBUG=1
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -118,8 +118,8 @@ MTL=midl.exe
 # ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG" /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG" /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -149,8 +149,8 @@ MTL=midl.exe
 # ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1 /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG" /d PNG_DEBUG=1 /d PNG_LIBPNG_SPECIALBUILD=""""Use MMX instructions""""
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -180,8 +180,8 @@ MTL=midl.exe
 # ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG" /dPNG_LIBPNG_DLLFNAME_POSTFIX=""""VB"""" /dPNG_LIBPNG_SPECIALBUILD=""""__stdcall calling convention used for exported functions""""
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG" /dPNG_LIBPNG_DLLFNAME_POSTFIX=""""VB"""" /dPNG_LIBPNG_SPECIALBUILD=""""__stdcall calling convention used for exported functions""""
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -213,8 +213,8 @@ CPP=cl.exe
 # ADD CPP /nologo /MD /W3 /O2 /I "..\.." /I "..\..\..\zlib" /D "PNG_NO_MMX_CODE" /D "WIN32" /D "NDEBUG" /D "_CRT_SECURE_NO_WARNINGS" /FD /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -240,8 +240,8 @@ CPP=cl.exe
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "DEBUG" /D "PNG_NO_MMX_CODE" /D PNG_DEBUG=1 /D "_CRT_SECURE_NO_WARNINGS" /FD /GZ /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /d "_DEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -267,8 +267,8 @@ CPP=cl.exe
 # ADD CPP /nologo /MD /W3 /O2 /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "PNG_USE_PNGVCRD" /D "PNG_LIBPNG_SPECIALBUILD" /D "_CRT_SECURE_NO_WARNINGS" /FD /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "NDEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "PNG_CONFIGURE_LIBPNG" /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
@@ -294,8 +294,8 @@ CPP=cl.exe
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "DEBUG" /D PNG_DEBUG=1 /D "PNG_USE_PNGVCRD" /D "PNG_LIBPNG_SPECIALBUILD" /D "_CRT_SECURE_NO_WARNINGS" /FD /GZ /c
 # SUBTRACT CPP /YX /Yc /Yu
 RSC=rc.exe
-# ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /d "_DEBUG"
+# ADD BASE RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
+# ADD RSC /l 0x409 /d "PNG_CONFIGURE_LIBPNG" /d "_DEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
diff --git a/projects/visualc71/libpng.vcproj b/projects/visualc71/libpng.vcproj
index 794e289d8637a007df685af5b1a17ffb78f0d800..03bb96f065c9c6f7d70b2a01a2b6e91929524f47 100644
--- a/projects/visualc71/libpng.vcproj
+++ b/projects/visualc71/libpng.vcproj
@@ -139,7 +139,7 @@
 				Name="VCPreLinkEventTool"/>
 			<Tool
 				Name="VCResourceCompilerTool"
-				AdditionalOptions="/d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
+				AdditionalOptions="/d PNG_CONFIGURE_LIBPNG /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
 				PreprocessorDefinitions="NDEBUG;_CRT_SECURE_NO_WARNINGS"
 				Culture="1033"
 				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
@@ -188,7 +188,7 @@
 				Name="VCPreLinkEventTool"/>
 			<Tool
 				Name="VCResourceCompilerTool"
-				AdditionalOptions="/d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
+				AdditionalOptions="/d PNG_CONFIGURE_LIBPNG /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
 				PreprocessorDefinitions="_DEBUG,PNG_DEBUG=1;_CRT_SECURE_NO_WARNINGS"
 				Culture="1033"
 				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
@@ -236,7 +236,7 @@
 				Name="VCPreLinkEventTool"/>
 			<Tool
 				Name="VCResourceCompilerTool"
-				AdditionalOptions="/d PNG_LIBPNG_DLLFNAME_POSTFIX=&quot;&quot;&quot;&quot;VB&quot;&quot;&quot;&quot; /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;__stdcall calling convention used for exported functions&quot;&quot;&quot;&quot;"
+				AdditionalOptions="/d PNG_CONFIGURE_LIBPNG /d PNG_LIBPNG_DLLFNAME_POSTFIX=&quot;&quot;&quot;&quot;VB&quot;&quot;&quot;&quot; /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;__stdcall calling convention used for exported functions&quot;&quot;&quot;&quot;"
 				PreprocessorDefinitions="NDEBUG;_CRT_SECURE_NO_WARNINGS"
 				Culture="1033"
 				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index fb9cedf97bd44df62d8b8dfef0db20fa2aa4f917..7c654dc2f48be5216797222e3975398c90f2555f 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -49,7 +49,7 @@ ZLIBINC=/usr/include
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) $(SUN_CC_FLAGS) \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) $(SUN_CC_FLAGS) \
 	# $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=$(SUN_LD_FLAGS) -L$(ZLIBLIB) -R$(ZLIBLIB) libpng.a -lz -lm
 
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index de2044c0bcc5f3c5fe58ee794ea54ac98fa06d14..2ea026eb5c881ac03220bddc527b475e867cdcae 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -49,7 +49,7 @@ ZLIBINC=/usr/include
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) $(SUN_CC_FLAGS) \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) $(SUN_CC_FLAGS) \
 	# $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -R. $(SUN_LD_FLAGS) -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
 
diff --git a/scripts/makefile.acorn b/scripts/makefile.acorn
index a0e577b245d635d9d676204cb3e53692ea35d39a..e2630d733eccab608fc80f8909e31e9011569163 100644
--- a/scripts/makefile.acorn
+++ b/scripts/makefile.acorn
@@ -2,7 +2,7 @@
 
 
 # Toolflags:
-CCflags = -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah
+CCflags = -DPNG_CONFIGURE_LIBPNG -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah
 C++flags = -c -depend !Depend -IC: -throwback
 Linkflags = -aif -c++ -o $@
 ObjAsmflags = -throwback -NoCache -depend !Depend
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index ce9b8f97dd0ed49e14963e770f5738455c38fd5c..a57b7a44842394097e857c68d33f7366884c57a6 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -48,7 +48,7 @@ LDDEBUG =
 CRELEASE = -O2
 LDRELEASE = -s
 WARNMORE=-W -Wall
-CFLAGS = -I$(ZLIBINC) $(WARNMORE) $(CRELEASE)
+CFLAGS = -DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) $(WARNMORE) $(CRELEASE)
 LDFLAGS = -L. -L$(ZLIBLIB) -lpng12 -lz -lm $(LDRELEASE)
 
 # File extensions
diff --git a/scripts/makefile.amiga b/scripts/makefile.amiga
index 8bf0f455f1251cd431051e07eb019ae221fb36d8..6a64260ac849b408983dd25836dcbd1f31179817 100644
--- a/scripts/makefile.amiga
+++ b/scripts/makefile.amiga
@@ -15,7 +15,7 @@ CC=sc
 #compiler flags
 # WARNING: a bug in V6.51 causes bad code with OPTGO
 #          So use V6.55 or set NOOPTGO!!!!!!!!!
-CFLAGS= NOSTKCHK PARMS=REG OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL\
+CFLAGS= -DPNG_CONFIGURE_LIBPNG NOSTKCHK PARMS=REG OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL\
 	OPTLOOP OPTRDEP=4 OPTDEP=4 OPTCOMP=4 INCLUDEDIR=$(ZLIB) \
 	DEFINE=PNG_INTERNAL
 #linker flags
diff --git a/scripts/makefile.atari b/scripts/makefile.atari
index 0e1ca72cfb78bb53006e2a84bbd436faa9c5769d..d2655248645e378c76910736cc3963a5598b0ca3 100644
--- a/scripts/makefile.atari
+++ b/scripts/makefile.atari
@@ -9,7 +9,7 @@
 # Modified for LC56/ATARI assumes libz.lib is in same dir and uses default
 # rules for library management
 #
-CFLAGS=-I..\zlib -O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I..\zlib -O
 LBR = png.lib
 LDFLAGS=-lpng -lz -lm
 
diff --git a/scripts/makefile.bc32 b/scripts/makefile.bc32
index 4b96231b540d73e4a09fb37c407b7cf527334894..82dd080cddb9b2acb8997dba51f1f7bf7c10c424 100644
--- a/scripts/makefile.bc32
+++ b/scripts/makefile.bc32
@@ -43,7 +43,7 @@ LDEBUG=$(LDEBUG) -N
 # -d  merge duplicate strings
 # -k- turn off standard stack frame
 # -w  display all warnings
-CFLAGS=-I$(ZLIB_DIR) -O2 -d -k- -w $(TARGET_CPU) $(CDEBUG)
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIB_DIR) -O2 -d -k- -w $(TARGET_CPU) $(CDEBUG)
 
 # -M  generate map file
 LDFLAGS=-L$(ZLIB_DIR) -M $(LDEBUG)
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 98e6a412c407f801d5f75240bf8972082275a007..26b0c535e35e5dc3ef4a84e1dcce942eb9d8de15 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -44,7 +44,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 
 # On BeOS, -O1 is actually better than -O3.  This is a known bug but it's
 # still here in R4.5
-CFLAGS=-I$(ZLIBINC) -W -Wall -O1 -funroll-loops \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O1 -funroll-loops \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 # LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz
 LDFLAGS=-L. -Wl,-soname=$(LIBSOMAJ) -L$(ZLIBLIB) -lz
diff --git a/scripts/makefile.bor b/scripts/makefile.bor
index e803184690184423cd10543e66859c68146a3889..fd54504140d815fa4725d66fa29007e5ba61f881 100644
--- a/scripts/makefile.bor
+++ b/scripts/makefile.bor
@@ -51,7 +51,7 @@ LDEBUG=$(LDEBUG) -N
 # -w  set all warnings on
 # -O2 optimize for speed
 # -Z  global optimization
-CFLAGS=-O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)
 
 # -M  generate map file
 LDFLAGS=-M -L$(ZLIB_DIR) $(MODEL_ARG) $(LDEBUG)
diff --git a/scripts/makefile.cegcc b/scripts/makefile.cegcc
index 55e710f7daffbf4bcf439817ce4c6b451495cdb9..1ca750e8c0aa3f3b46386651633efedf9e9cf574 100644
--- a/scripts/makefile.cegcc
+++ b/scripts/makefile.cegcc
@@ -64,7 +64,7 @@ copy-src:
 
 compilation:
 	@echo " * Compilation of $(PACKAGE)"
-	cd $(PACKAGE) && CPPFLAGS="$(CPPFLAGS) -DPNG_BUILD_DLL -DPNG_CONSOLE_IO_SUPPORTED -DPNG_NO_MMX_CODE -D_WIN32_WCE=0x0420" CFLAGS="$(CFLAGS) -mms-bitfields -O3 -pipe -fomit-frame-pointer" LDFLAGS="$(LDFLAGS) -Wl,--enable-auto-import -Wl,-s" ./configure --prefix=/opt/wince --host=arm-mingw32ce && make
+	cd $(PACKAGE) && CPPFLAGS="$(CPPFLAGS) -DPNG_BUILD_DLL -DPNG_CONSOLE_IO_SUPPORTED -DPNG_NO_MMX_CODE -D_WIN32_WCE=0x0420" CFLAGS="$(CFLAGS) -DPNG_CONFIGURE_LIBPNG -mms-bitfields -O3 -pipe -fomit-frame-pointer" LDFLAGS="$(LDFLAGS) -Wl,--enable-auto-import -Wl,-s" ./configure --prefix=/opt/wince --host=arm-mingw32ce && make
 
 copy:
 	@echo " * Copy of binary and development files"
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index 031d1aaa2a42bf4e308055feb47743d96186d776..6db83d085d9d1746ef89b95bf77c065f43e7a71b 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -36,7 +36,7 @@ DESTDIR=
 
 CC=gcc
 ifdef MINGW
-MINGW_CCFLAGS=-mno-cygwin -I/usr/include/mingw
+MINGW_CCFLAGS=-DPNG_CONFIGURE_LIBPNG -mno-cygwin -I/usr/include/mingw
 MINGW_LDFLAGS=-mno-cygwin -L/usr/lib/mingw
 endif
 
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index d337bd2088dba01e88f66b16c399b4ec6c17e0c0..084df5a9adf4bef6d6c5d59ca89005dd80949faf 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -41,7 +41,7 @@ LN_SF=ln -sf
 RANLIB=ranlib
 RM_F=/bin/rm -f
 
-# CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE
+# CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE
 CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O -funroll-loops
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz
 
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 6cc77d4a680f8cf349e8c60d36ab3a80259b3910..045851cdecedb1fb74eee4abe4342783c7f184a6 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -57,7 +57,7 @@ DM=$(DESTDIR)$(MANPATH)
 ZLIBLIB=../zlib
 ZLIBINC=../zlib
 
-CFLAGS=-std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
 LDFLAGS=-L$(ZLIBLIB) -rpath $(ZLIBLIB) libpng.a -lz -lm
 
 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
diff --git a/scripts/makefile.dj2 b/scripts/makefile.dj2
index b8457ee49f186da32afb352cba151c5034970066..f37ec964db81f5a476c813f5d193a0acdb1ee89e 100644
--- a/scripts/makefile.dj2
+++ b/scripts/makefile.dj2
@@ -13,7 +13,7 @@ INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
 
 CC=gcc
-CFLAGS=-I../zlib -O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I../zlib -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
 
 RANLIB=ranlib
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 78438eff5d36a585a500cc98684563cf9174f84f..4e910b5ada10813936dfe4e1414d932c45c62e31 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -57,7 +57,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-W -Wall -D_REENTRANT -O2 \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -W -Wall -D_REENTRANT -O2 \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 
 LDFLAGS=-L. -lpng12
diff --git a/scripts/makefile.freebsd b/scripts/makefile.freebsd
index daf91bd99de51adc9a2391d45d51cc47d8ef6161..5b31465f1ca471c35d5c27e88a39abc2739b5bd7 100644
--- a/scripts/makefile.freebsd
+++ b/scripts/makefile.freebsd
@@ -27,7 +27,7 @@ SYMLINKS=       libpng/png.h ${INCSDIR}/../png.h \
 LDADD+=         -lm -lz
 DPADD+=         ${LIBM} ${LIBZ}
 
-CFLAGS+= -I.
+CFLAGS+= -DPNG_CONFIGURE_LIBPNG -I.
 .if (${MACHINE_ARCH} != "i386")
 CFLAGS+= -DPNG_CONFIGURE_LIBPNG -DPNG_NO_MMX_CODE
 .endif
diff --git a/scripts/makefile.gcc b/scripts/makefile.gcc
index ed7cd866827cb87f6ce8e3f542fa8c1f2bf5927c..2eff467e462c61dcedd80b4d3095a8935a32dbd5 100644
--- a/scripts/makefile.gcc
+++ b/scripts/makefile.gcc
@@ -22,8 +22,8 @@ CDEBUG = -g -DPNG_DEBUG=5
 LDDEBUG =
 CRELEASE = -O2
 LDRELEASE = -s
-#CFLAGS = -W -Wall $(CDEBUG)
-CFLAGS = -W -Wall $(CRELEASE)
+#CFLAGS = -DPNG_CONFIGURE_LIBPNG -W -Wall $(CDEBUG)
+CFLAGS = -DPNG_CONFIGURE_LIBPNG -W -Wall $(CRELEASE)
 #LDFLAGS = $(LDDEBUG)
 LDFLAGS = $(LDRELEASE)
 LIBS = -lz -lm
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index 7587361dd808c5e1dccc546ac7b11a91159f8137..5a94a3d347f46c1586d652f8f1274b60b852ea4d 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -14,7 +14,7 @@ ZLIBINC=/opt/zlib/include
 # Note that if you plan to build a libpng shared library, zlib must also
 # be a shared library, which zlib's configure does not do.  After running
 # zlib's configure, edit the appropriate lines of makefile to read:
-#   CFLAGS=-O1 -DHAVE_UNISTD -DUSE_MAP -fPIC \
+#   CFLAGS=-DPNG_CONFIGURE_LIBPNG -O1 -DHAVE_UNISTD -DUSE_MAP -fPIC \
 #   LDSHARED=ld -b
 #   SHAREDLIB=libz.sl
 
@@ -40,10 +40,10 @@ LN_SF=ln -sf
 RANLIB=ranlib
 RM_F=/bin/rm -f
 
-CFLAGS=-I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 +Z -DHAVE_UNISTD_H -DUSE_MMAP
 # Caution: be sure you have built zlib with the same CFLAGS.
-CCFLAGS=-I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
+CCFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae -Wl,+vnocompatwarnings +DD64 \
 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 +Z -DHAVE_UNISTD_H -DUSE_MMAP
 
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index abd84faf71d46f8f47418c3c2af9eb15f80cae89..2a7072d8f0c9a951886462946127c526b6a6585b 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -56,7 +56,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 #LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz -lm
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 80991dea8482300750b237486c38a2ca589c4d28..d5c8f0b4d2f82f64f0ba5a6517b731dde286ad9d 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -48,9 +48,9 @@ LIBPATH=$(exec_prefix)/lib
 MANPATH=$(prefix)/man
 BINPATH=$(exec_prefix)/bin
 
-CFLAGS=-I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0 -DPNG_NO_MMX_CODE
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0 -DPNG_NO_MMX_CODE
 # Caution: be sure you have built zlib with the same CFLAGS.
-CCFLAGS=-I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0
+CCFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 # override DESTDIR= on the make install command line to easily support
diff --git a/scripts/makefile.ibmc b/scripts/makefile.ibmc
index 3d540d2860fe554501943f4b30ba8c5a5bcc46b0..8d02a8387124b4ddb2a808c21f52e6a49ba6ee1e 100644
--- a/scripts/makefile.ibmc
+++ b/scripts/makefile.ibmc
@@ -23,7 +23,7 @@ LD = ilink
 AR = ilib
 RM = del
 
-CFLAGS = -I$(ZLIBINC) -Mc -O2 -W3
+CFLAGS = -DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -Mc -O2 -W3
 LDFLAGS =
 
 # File extensions
diff --git a/scripts/makefile.intel b/scripts/makefile.intel
index 3b1cdde40ac096f680b163c2cf753612ffc8a64b..79f34ed0f81116d9d48c058397d965ea6f7ace02 100644
--- a/scripts/makefile.intel
+++ b/scripts/makefile.intel
@@ -32,7 +32,7 @@ CALLING=r	# __fastcall
 # --------------------------------------------------------------------------
 
 CC=icl -c
-CFLAGS=-O2 -G$(CPU)$(CALLING) -Qip -Qunroll4 -I$(ZLIBINC) -nologo
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -O2 -G$(CPU)$(CALLING) -Qip -Qunroll4 -I$(ZLIBINC) -nologo
 LD=link
 LDFLAGS=/SUBSYSTEM:CONSOLE /NOLOGO
 
diff --git a/scripts/makefile.knr b/scripts/makefile.knr
index 3a2067481a6630c1de78cb98dacbbec558508cbf..75453196a0b7cb83226386d708fdedaee3c352d6 100644
--- a/scripts/makefile.knr
+++ b/scripts/makefile.knr
@@ -27,7 +27,7 @@ LIBPATH=$(prefix)/lib
 DESTDIR=
 
 CC=cc
-CFLAGS=-I../zlib -O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I../zlib -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
 # flags for ansi2knr
 ANSI2KNRFLAGS=
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 397c8571084d7c6d0bf2006659630ab564744587..67c514d858d253fe2508e4e3b962b1a5125d5735 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -51,7 +51,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 212379aee654c514e00552912026e85becf08b3b..e6d45f23065c7e0bc05d9d1cb8a322471c77c6ca 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -62,15 +62,15 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
 
 ### if you don't need thread safety, but want the asm accel
-#CFLAGS= $(strip $(MINGW_CCFLAGS) -DPNG_THREAD_UNSAFE_OK \
+#CFLAGS= -DPNG_CONFIGURE_LIBPNG $(strip $(MINGW_CCFLAGS) -DPNG_THREAD_UNSAFE_OK \
 #	$(addprefix -I,$(ZLIBINC)) -W -Wall -O $(ALIGN) -funroll-loops \
 #	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### if you need thread safety and want (minimal) asm accel
-#CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
+#CFLAGS= -DPNG_CONFIGURE_LIBPNG $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 #	-W -Wall -O $(ALIGN) -funroll-loops \
 #	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### Normal (non-asm) compilation
-CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
+CFLAGS= -DPNG_CONFIGURE_LIBPNG $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
         -W -Wall -O3 $(ALIGN) -funroll-loops -DPNG_NO_MMX_CODE \
 	-fomit-frame-pointer) # $(WARNMORE) -g -DPNG_DEBUG=5
 
diff --git a/scripts/makefile.mips b/scripts/makefile.mips
index 2c7082decfbd17c68399d6b652b892333fc763ea..8765066a9e1b02140142889d3b21d955641a6d7e 100644
--- a/scripts/makefile.mips
+++ b/scripts/makefile.mips
@@ -22,8 +22,8 @@ LIBPATH=$(prefix)/lib
 DESTDIR=
 
 CC=cc
-CFLAGS=-I../zlib -O -systype sysv -DSYSV -w -Dmips
-#CFLAGS=-O
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I../zlib -O -systype sysv -DSYSV -w -Dmips
+#CFLAGS=-DPNG_CONFIGURE_LIBPNG -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
 
 #RANLIB=ranlib
diff --git a/scripts/makefile.msc b/scripts/makefile.msc
index df9e84dd755d35c7be61263a86f4bd19930ec766..d5a9ba15e6657b42ceae4097a75d9eb45c160195 100644
--- a/scripts/makefile.msc
+++ b/scripts/makefile.msc
@@ -10,7 +10,7 @@
 
 # -------- Microsoft C 5.1 and later, does not use assembler code --------
 MODEL=L
-CFLAGS=-Oait -Gs -nologo -W3 -A$(MODEL) -I..\zlib
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -Oait -Gs -nologo -W3 -A$(MODEL) -I..\zlib
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 432b9a3634d2ddb0fbe510e5ac09decf5fb38eac..7a94815e6fe69c4e479947a99bddd57efa72f022 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -29,10 +29,10 @@ CPPFLAGS+=-I${.CURDIR}
 # We should be able to do something like this instead of the manual
 # uncommenting, but it core dumps for me at the moment:
 # .if ${MACHINE_ARCH} == "i386"
-#   CPPFLAGS+=-DPNG_THREAD_UNSAFE_OK
+#   CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_THREAD_UNSAFE_OK
 #   MKLINT= no
 # .else
-    CPPFLAGS+=-DPNG_NO_MMX_CODE
+    CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_NO_MMX_CODE
 # .endif
 
 CLEANFILES+=pngtest.o pngtest
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index 9a101104504c0af9b658c59f569e05d9516b9537..dbf962a09eff45e3daeb0bb9f6d786633d4fe002 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -29,10 +29,10 @@ CPPFLAGS+=-I${.CURDIR}
 # We should be able to do something like this instead of the manual
 # uncommenting, but it core dumps for me at the moment:
 # .if ${MACHINE_ARCH} == "i386"
-#   CPPFLAGS+=-DPNG_THREAD_UNSAFE_OK
+#   CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_THREAD_UNSAFE_OK
 #   MKLINT= no
 # .else
-    CPPFLAGS+=-DPNG_NO_MMX_CODE
+    CPPFLAGS+=-DPNG_CONFIGURE_LIBPNG -DPNG_NO_MMX_CODE
 # .endif
 
 CLEANFILES+=pngtest.o pngtest
diff --git a/scripts/makefile.nommx b/scripts/makefile.nommx
index f152f0df373ecaa0aa78cc44a4a22b906d8c1c7c..c7bc833dd588a0c0009df86f6b8b953ba6d99d09 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -51,7 +51,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.
 
-CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index eca9b3d9811680a463d57603ae344579dfc386e7..b9604ef61eb8fce68f4454cc66bdbfdd10c63a85 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -20,7 +20,7 @@ SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
 
 HDRS=	png.h pngconf.h
 
-CFLAGS+= -W -Wall
+CFLAGS+= -DPNG_CONFIGURE_LIBPNG -W -Wall
 CPPFLAGS+= -I${.CURDIR} -DPNG_NO_MMX_CODE
 
 NOPROFILE= Yes
diff --git a/scripts/makefile.os2 b/scripts/makefile.os2
index 907cfc8945576fc405770f24df21490aa13e58f4..e190c0a6ca5e29892c91c082d1cfb9dbb171ad43 100644
--- a/scripts/makefile.os2
+++ b/scripts/makefile.os2
@@ -15,7 +15,7 @@ ZLIBINC=../zlib
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) -W -Wall -O6 -funroll-loops -malign-loops=2 \
+CFLAGS=--DPNG_CONFIGURE_LIBPNG I$(ZLIBINC) -W -Wall -O6 -funroll-loops -malign-loops=2 \
 	-malign-functions=2 #$(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lzdll -Zcrtdll
 AR=emxomfar
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 607bdfadf32e066c57cd5ceabf70063289a20636..4ce7413fe3732aecdf9d371c8391e4c49115b31a 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -41,7 +41,7 @@ exec_prefix=$(prefix)
 ZLIBLIB=../zlib
 ZLIBINC=../zlib
 
-CFLAGS= -dy -belf -I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
+CFLAGS= -DPNG_CONFIGURE_LIBPNG -dy -belf -I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz -lm
 
 INCPATH=$(prefix)/include/libpng
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index aa63d69dbef05503d9d06ca8997645c424211bee..b298be30ecb1ce6849fd256808bd48306664e97b 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -47,7 +47,7 @@ ZLIBINC=../zlib
 ABI=
 
 WARNMORE= # -g -DPNG_DEBUG=5
-CFLAGS=$(ABI) -I$(ZLIBINC) -O $(WARNMORE) -fPIC -mabi=n32 -DPNG_NO_MMX_CODE
+CFLAGS=-DPNG_CONFIGURE_LIBPNG $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -fPIC -mabi=n32 -DPNG_NO_MMX_CODE
 LDFLAGS=$(ABI) -L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=cc $(ABI) -shared -soname $(LIBSOMAJ) \
   -set_version sgi$(PNGMAJ).0
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index 9435fd6d4f6f0bc44c80eb90ca2dd3fc53dad009..17f4591b25463a7896e5a9508b5d3ec2d79040a3 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -48,8 +48,8 @@ ABI=
 
 WARNMORE=-fullwarn
 # Note: -KPIC is the default anyhow
-#CFLAGS= $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -KPIC -DPNG_NO_MMX_CODE # -g -DPNG_DEBUG=5
-CFLAGS=$(ABI) -I$(ZLIBINC) -O $(WARNMORE) -DPNG_NO_MMX_CODE
+#CFLAGS= -DPNG_CONFIGURE_LIBPNG $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -KPIC -DPNG_NO_MMX_CODE # -g -DPNG_DEBUG=5
+CFLAGS=-DPNG_CONFIGURE_LIBPNG $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -DPNG_NO_MMX_CODE
 LDFLAGS_A=$(ABI) -L. -L$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS=$(ABI) -L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=cc $(ABI) -shared -soname $(LIBSOMAJ) \
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index 3cbfcb73e210ec4d116a80671a7743fe3c82bccc..2c8668acb2545d93ea0419d72177785cfa605a99 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -50,8 +50,8 @@ ZLIBINC=/usr/include
 #WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-#CFLAGS=-I$(ZLIBINC) -W -Wall -O3 $(WARNMORE) -g -DPNG_DEBUG=5 -DPNG_NO_MMX_CODE
-CFLAGS=-I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
+#CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O3 $(WARNMORE) -g -DPNG_DEBUG=5 -DPNG_NO_MMX_CODE
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O3 -DPNG_NO_MMX_CODE
 LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
 
 INCPATH=$(prefix)/include
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index 6ed4f6b9e21b9cd6f62dba823446802e0770249d..d57734c82a65d3c6f2e3d2a63b825f6ba444d285 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -46,7 +46,7 @@ ZLIBINC=/usr/local/include
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) -W -Wall -O -DPNG_NO_MMX_CODE; \
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O -DPNG_NO_MMX_CODE; \
 	# $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
 
diff --git a/scripts/makefile.std b/scripts/makefile.std
index 262d153c36d11871e2ea9b612628736a13b6cc13..abbf9b999234b6d0a7658d3ddb0605ae2719edfd 100644
--- a/scripts/makefile.std
+++ b/scripts/makefile.std
@@ -34,7 +34,7 @@ LN_SF=ln -sf
 RANLIB=ranlib
 RM_F=rm -f
 
-CFLAGS=-I$(ZLIBINC) -O # -g -DPNG_DEBUG=5
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O # -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
diff --git a/scripts/makefile.sunos b/scripts/makefile.sunos
index 0cef4fcb9c122c2e5b4007c9787c3792d1aead3b..7feb04c79af3974537948e33814b2081991b37d4 100644
--- a/scripts/makefile.sunos
+++ b/scripts/makefile.sunos
@@ -39,7 +39,7 @@ LN_SF=ln -f -s
 RANLIB=ranlib
 RM_F=/bin/rm -f
 
-CFLAGS=-I$(ZLIBINC) -O # $(WARNMORE) -DPNG_DEBUG=5
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -O # $(WARNMORE) -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
diff --git a/scripts/makefile.tc3 b/scripts/makefile.tc3
index 21435a68edb4e1fb6d9772b56e4eccbb6b0ea158..951af0d5cda6ad232782a95ff2f7625efae26ad7 100644
--- a/scripts/makefile.tc3
+++ b/scripts/makefile.tc3
@@ -6,8 +6,8 @@
 # ----- Turbo C 3.00 (can be modified to work with earlier versions) -----
 
 MODEL=l
-CFLAGS=-O2 -Z -m$(MODEL) -I..\zlib
-#CFLAGS=-D_NO_PROTO -O2 -Z -m$(MODEL) -I..\zlib  # Turbo C older than 3.00
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -O2 -Z -m$(MODEL) -I..\zlib
+#CFLAGS=-DPNG_CONFIGURE_LIBPNG -D_NO_PROTO -O2 -Z -m$(MODEL) -I..\zlib  # Turbo C older than 3.00
 CC=tcc
 LD=tcc
 LIB=tlib
diff --git a/scripts/makefile.vcawin32 b/scripts/makefile.vcawin32
index 1b58300f5216704939564a159386a1dfc774ea50..533cb298d3e0b874255c794d858a190da0eb9bdd 100644
--- a/scripts/makefile.vcawin32
+++ b/scripts/makefile.vcawin32
@@ -16,7 +16,7 @@
 CC = cl
 LD = link
 AR = lib
-CFLAGS  = -nologo -DPNG_USE_PNGVCRD -MD -O2 -W3 -I..\zlib
+CFLAGS  = -DPNG_CONFIGURE_LIBPNG -nologo -DPNG_USE_PNGVCRD -MD -O2 -W3 -I..\zlib
 LDFLAGS = -nologo
 ARFLAGS = -nologo
 RM = del
diff --git a/scripts/makefile.vcwin32 b/scripts/makefile.vcwin32
index 3cdfb39049590875436cf4f6fbe720c8410944d0..38e834a8bb6b41dd6cf564f3f78ab3aec8ab2549 100644
--- a/scripts/makefile.vcwin32
+++ b/scripts/makefile.vcwin32
@@ -16,7 +16,7 @@
 CC = cl
 LD = link
 AR = lib
-CFLAGS  = -nologo -DPNG_NO_MMX_CODE -MD -O2 -W3 -I..\zlib
+CFLAGS  = -DPNG_CONFIGURE_LIBPNG -nologo -DPNG_NO_MMX_CODE -MD -O2 -W3 -I..\zlib
 LDFLAGS = -nologo
 ARFLAGS = -nologo
 RM = del
diff --git a/scripts/makefile.watcom b/scripts/makefile.watcom
index 4a8c7d7d247df6a287a3d6e471654d6c1657e506..bff6ebcb8bc09f26b50b520cba1ca90c3aa0a7da 100644
--- a/scripts/makefile.watcom
+++ b/scripts/makefile.watcom
@@ -36,7 +36,7 @@ CALLING=r	# registers
 
 
 CC=wcc386
-CFLAGS=-$(CPU)$(CALLING) -fp$(CPU) -fpi87 -oneatx -mf -bt=$(OS) -i=$(ZLIBINC) -zq
+CFLAGS=-DPNG_CONFIGURE_LIBPNG -$(CPU)$(CALLING) -fp$(CPU) -fpi87 -oneatx -mf -bt=$(OS) -i=$(ZLIBINC) -zq
 LD=wcl386
 LDFLAGS=-zq