--- Makefile.orig	Mon Oct 26 05:47:44 1998
+++ Makefile	Sun Feb 14 17:39:37 1999
@@ -13,8 +13,8 @@
                -Wmissing-declarations -Wreturn-type \
                -Wnested-externs -Wwrite-strings -Wcast-qual
 INCDIR = -I. -I/usr/include 
-CFLAGS = $(DEFINES) $(LANG_OPTIONS) $(WARN_OPTIONS) $(INCDIR)
-COPTS = -O2
+CFLAGS?= -O2
+CFLAGS+= $(DEFINES) $(LANG_OPTIONS) $(WARN_OPTIONS) $(INCDIR)
 
 ######## link options ########
 LD = gcc
@@ -36,7 +36,7 @@
 
 %o: %c
 	@echo --- compiling: $< ---
-	$(CC) $(CFLAGS) $(COPTS) -c $< -o $@
+	$(CC) $(CFLAGS) -c $< -o $@
 
 clean:
 	rm -f probability.o interactive.o display.o simulate.o core