diff -urN libmng-1.0.10/makefiles/configure.in libmng-1.0.10-patched/makefiles/configure.in
--- libmng-1.0.10/makefiles/configure.in	2005-01-30 20:28:00.000000000 +1000
+++ libmng-1.0.10-patched/makefiles/configure.in	2012-08-06 19:10:49.532052019 +1100
@@ -15,7 +15,6 @@
 dnl Checks for programs.
 AC_PROG_CC
 AC_ISC_POSIX
-AM_C_PROTOTYPES
 if test "x$U" != "x"; then
   AC_MSG_ERROR(Compiler not ANSI compliant)
 fi