--- Makefile.sav	2006-11-13 15:02:44.000000000 -0500
+++ Makefile	2006-11-13 15:04:34.000000000 -0500
@@ -2,7 +2,7 @@
 
 CFLAGS= -O
 fixed-flags = -I$(srcdir) -I$(srcdir)/box
-all-C-flags:= -ansi $(fixed-flags) $(CFLAGS)
+all-C-flags:= -ansi -D_ANSI_SOURCE $(fixed-flags) $(CFLAGS)
 non-ansi-flags :=  $(fixed-flags) $(CFLAGS)
 
 CC = gcc # some compiler for ANSI/ISO C