+Use pkg-config to report libpng version and installation directories.
+
+
+diff -Naur libpng-1.2.31.orig/scripts/libpng-config.in libpng-1.2.31/scripts/libpng-config.in
+--- libpng-1.2.31.orig/scripts/libpng-config.in 2008-05-29 13:37:58.000000000 -0400
++++ libpng-1.2.31/scripts/libpng-config.in 2008-08-23 16:57:20.000000000 -0400
+@@ -8,11 +8,11 @@
+
+ # Modeled after libxml-config.
+
+-version="@PNGLIB_VERSION@"
+-prefix="@prefix@"
+-exec_prefix="@exec_prefix@"
+-libdir="@libdir@"
+-includedir="@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
++version=`pkg-config --modversion libpng`
++prefix=`pkg-config --variable prefix libpng`
++exec_prefix=`pkg-config --variable exec_prefix libpng`
++libdir=`pkg-config --variable libdir libpng`
++includedir=`pkg-config --variable includedir libpng`
+ libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
+ all_libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ @LIBS@"
+ I_opts="-I${includedir}"