--- configure.ac.old	2011-04-24 08:20:56.000000000 +0000
+++ configure.ac	2011-04-24 08:21:13.000000000 +0000
@@ -61,6 +61,8 @@
 case $host_os in
   aix*)
    LIBPNG_DEFINES="-DPNG_CONFIGURE_LIBPNG -D_ALL_SOURCE";;
+  mint*)
+   LIBPNG_DEFINES="-DPNG_CONFIGURE_LIBPNG -D_GNU_SOURCE";;
   *)
    LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG;;
 esac