diff -up enscript-1.6.6/configure.ac.build enscript-1.6.6/configure.ac
--- enscript-1.6.6/configure.ac.build	2012-09-25 21:22:49.000000000 +0200
+++ enscript-1.6.6/configure.ac	2012-09-26 15:46:10.988041135 +0200
@@ -11,7 +11,6 @@ AC_PROG_INSTALL
 AC_PROG_CC
 
 AC_USE_SYSTEM_EXTENSIONS
-AM_C_PROTOTYPES
 
 AC_C_CONST
 AC_FUNC_ALLOCA