--- adpcm/Makefile.orig	Fri Dec 31 15:34:54 1999
+++ adpcm/Makefile	Fri Dec 31 15:35:09 1999
@@ -1,7 +1,7 @@
 #
 # Makefile for adpcm and test programs
 # -------------------
-CFLAGS=-O -I..
+CFLAGS+= -I..
 # May need this on a sun:
 #CFLAGS=-O -I/usr/demo/SOUND