diff --git a/Makefile b/Makefile
index 3218aef..a14f083 100644
--- a/Makefile
+++ b/Makefile
@@ -29,10 +29,12 @@ distclean: $(patsubst %, %.distclean, $(SUB))
 spotless: distclean
 	rm -f configure acconfig.h.in
 
-config:	MCONFIG
+autoconf: configure acconfig.h.in
+
+config:	MCONFIG acconfig.h
 
 release:
-	$(MAKE) configure acconfig.h.in
+	$(MAKE) autoconf
 	$(MAKE) distclean
 
 MCONFIG: configure MCONFIG.in acconfig.h.in
diff --git a/config.h b/config.h
index dafd3b3..d0c95bb 100644
--- a/config.h
+++ b/config.h
@@ -23,6 +23,7 @@
 
 /* This is necessary on Solaris */
 #define _XPG4_2
+#define _XOPEN_SOURCE
 
 /* Standard includes */