--- libmng-1.0.10/makefiles/configure.in.automake1_12	2005-01-30 11:28:00.000000000 +0100
+++ libmng-1.0.10/makefiles/configure.in	2012-12-06 23:44:56.247185661 +0100
@@ -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