--- configure.ac.bak	2012-06-13 13:08:34.806246353 +0200
+++ configure.ac	2012-06-13 13:08:56.166979304 +0200
@@ -27,7 +27,7 @@ AC_MSG_RESULT($mutt_cv_prefix)
 
 AC_PROG_CC
 AC_ISC_POSIX
-AM_C_PROTOTYPES
+
 if test "x$U" != "x"; then
   AC_MSG_ERROR(Compiler not ANSI compliant)
 fi