--- gforth/lib.fs	2007/02/17 21:04:15	1.18
+++ gforth/lib.fs	2007/06/01 16:27:37	1.19
@@ -24,6 +24,9 @@
     [IFDEF] ffi-call
 	include libffi.fs
     [ELSE]
+        .( Neither libffi nor ffcall are available ) cr
+        abort
+        .( Using oldlib.fs; incompatible with fflib.fs and libffi.fs) cr
 	include oldlib.fs
     [THEN]
 [THEN]