remember that for static linking png required zlib

png/png.patch

@@ -1,7 +1,7 @@
 Index: pngconf.h
---- pngconf.h.orig	2004-12-03 01:14:24.000000000 +0100
-+++ pngconf.h	2005-02-16 21:37:27.926893025 +0100
-@@ -303,9 +303,9 @@
+--- pngconf.h.orig	2006-06-27 22:22:34 +0200
++++ pngconf.h	2006-11-12 12:17:37 +0100
+@@ -313,9 +313,9 @@
  #    ifdef _SETJMP_H
       /* If you encounter a compiler error here, see the explanation
        * near the end of INSTALL.
@@ -12,3 +12,12 @@ Index: pngconf.h
  #    endif
  #  endif /* __linux__ */
  
+Index: scripts/libpng.pc.in
+--- scripts/libpng.pc.in.orig	2006-06-27 22:22:40 +0200
++++ scripts/libpng.pc.in	2006-11-12 12:18:12 +0100
+@@ -7,4 +7,5 @@
+ Description: Loads and saves PNG files
+ Version: 1.2.12
+ Libs: -L${libdir} -lpng12
++Libs.private: -lz
+ Cflags: -I${includedir}

png/png.spec

@@ -33,7 +33,7 @@ Class:        BASE
 Group:        Graphics
 License:      BSD
 Version:      1.2.12
-Release:      20061013
+Release:      20061112
 
 #   list of sources
 Source0:      http://switch.dl.sourceforge.net/sourceforge/libpng/libpng-%{version}.tar.gz