--- a/Makefile
+++ b/Makefile
@@ -5,21 +5,19 @@
 # See the file LICENSE for license terms.
 #
 
-DEFS=-DBUILTIN_INCLUDE1=\"/usr/local/share/picasm/include\"
+CPPFLAGS += -DBUILTIN_INCLUDE1=\"/usr/share/picasm/include\"
 #DEFS=-DBUILTIN_INCLUDE1=\"/home/trossi/bin/picasm-include\"
 
-CC = gcc
-CFLAGS = -Wall -Wshadow -W -Werror -O2 $(DEFS)
+CFLAGS += -Wall -Wshadow -W
 RM = /bin/rm -f
 
 VERSION=114
 
-OBJS = picasm.o config.o token.o symtab.o expr.o \
+OBJS = config.o token.o symtab.o expr.o \
        pic12bit.o pic14bit.o pic16bit.o \
        util.o
 
 picasm: $(OBJS)
-	$(CC) $(CFLAGS) $(OBJS) -o $@
 
 clean:
 	$(RM) picasm *.o examples/*.hex examples/*.lst