diff -Naur minicom-2.5.old/configure.in minicom-2.5/configure.in
--- minicom-2.5.old/configure.in	2012-11-21 17:10:32.000000000 +0100
+++ minicom-2.5/configure.in	2012-11-21 17:32:24.146297983 +0100
@@ -174,7 +174,6 @@
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
-AM_C_PROTOTYPES
 AC_TYPE_UID_T
 AC_TYPE_MODE_T
 AC_TYPE_PID_T