--- gforth/lib.fs	2006/12/31 13:39:13	1.17
+++ gforth/lib.fs	2007/06/01 16:27:37	1.19
@@ -24,12 +24,29 @@
     [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]
 
 \ testing stuff
 
+[IFUNDEF] libc
+    s" os-type" environment? [IF]
+	2dup s" linux-gnu" str= [IF]  2drop
+	    library libc libc.so.6
+	[ELSE] 2dup s" cygwin" str= [IF]  2drop
+		library libc cygwin1.dll
+	    [ELSE]  s" bsd" search nip nip [IF]
+		    library libc libc.so
+		[THEN]
+	    [THEN]
+	[THEN]
+    [THEN]
+[THEN]
+
 [ifdef] testing
 
 library libc libc.so.6