--- corkscrew-2.0/configure.in.orig
+++ corkscrew-2.0/configure.in
@@ -1,7 +1,6 @@
 AC_INIT(corkscrew.c)
 AM_INIT_AUTOMAKE(corkscrew, 2.0)
 AM_CONFIG_HEADER(config.h:config.in)
-AM_C_PROTOTYPES
 
 AC_PROG_CC
 AC_PROG_AWK
