--- gforth/envos.fs.in	2008/08/08 20:56:14	1.8
+++ gforth/envos.fs.in	2009/10/14 17:44:04	1.11
@@ -32,10 +32,17 @@ set-current
 
 : libtool-cc ( -- c-addr u ) \ gforth
 \G invocation string of the C compiler used for libtool
-    s" @CC@" ;
+    s" @LIBTOOL_CC@" ;
+
+: libtool-flags ( -- c-addr u ) \ gforth
+\G force no undefined for cygwin
+    [ s" @host_os@" s" cygwin" str= ] [IF]  s"  -no-undefined "
+    [ELSE]  s" "  [THEN] ;
 
 \ test for the presence of libffi or ffcall
 @FFCALLFLAG@ constant ffcall-present \ libffi present (on building)
 @LIBFFIFLAG@ constant libffi-present \ ffcall libs present (on building)
 
+: include-ffi.h-string ( -- c-addr u )
+  s" #include <@FFI_H_NAME@>" ;