diff -up sbcl-1.0.16/contrib/asdf-module.mk.GNU_SOURCE sbcl-1.0.16/contrib/asdf-module.mk
--- sbcl-1.0.16/contrib/asdf-module.mk.GNU_SOURCE	2008-04-25 09:30:41.000000000 -0500
+++ sbcl-1.0.16/contrib/asdf-module.mk	2008-04-25 09:30:34.000000000 -0500
@@ -9,6 +9,9 @@ CC=gcc
 
 UNAME:=$(shell uname -s)
 
+ifeq (Linux,$(UNAME))
+  EXTRA_CFLAGS+=-D_GNU_SOURCE
+endif
 ifeq (SunOS,$(UNAME))
   EXTRA_CFLAGS=-D_XOPEN_SOURCE=500 -D__EXTENSIONS__
 endif