--- gforth/configure.in	2009/03/17 17:42:57	1.270
+++ gforth/configure.in	2009/12/31 15:32:35	1.273
@@ -1,6 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
 
-#Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008 Free Software Foundation, Inc.
+#Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
 
 #This file is part of Gforth.
 
@@ -608,6 +608,21 @@ AC_TRY_COMPILE(,,ac_align_jumps=yes;ENGI
 CFLAGS="$CFLAGS_1"
 AC_MSG_RESULT($ac_align_jumps)
 
+if test -z "$LIBTOOL_CC"
+then
+  LIBTOOL_CC="$CC"
+  # Try if GCC understands -Wimplicit-function-declaration
+  AC_MSG_CHECKING([if $CC understands -Wimplicit-function-declaration])
+  CFLAGS_1="$CFLAGS"
+  CFLAGS="$CFLAGS -Wimplicit-function-declaration"
+  AC_TRY_COMPILE(,,LIBTOOL_CC="$CC -Wimplicit-function-declaration",)
+  CFLAGS="$CFLAGS_1"
+  AC_MSG_RESULT($ac_align_jumps)
+fi
+AC_SUBST(LIBTOOL_CC)
+
+
+
 # Try if GCC understands __attribute__((unused))
 AC_MSG_CHECKING([how to suppress 'unused variable' warnings])
 AC_TRY_COMPILE(,[int __attribute__((unused)) foo;], MAYBE_UNUSED='__attribute__((unused))',)
@@ -926,3 +941,4 @@ ln -sf ../../../engine/config.h ../../..
  machine=$machine])
 AC_OUTPUT
 
+test -z "$GNU_LIBTOOL" && echo * Problem: no libtool found, libcc.fs will not work