--- Makefile.in.orig	Thu Apr 13 13:54:19 2006
+++ Makefile.in	Thu Apr 13 13:54:25 2006
@@ -17,7 +17,7 @@
 LIBRARIES = @LIBS@
 YACC = @YACC@
 
-CFLAGS = -O
+CFLAGS?= -O
 # If you're using GCC, you may prefer:
 # CFLAGS = -O2 -finline-functions
 #