--- Makefile
+++ Makefile
@@ -6,8 +6,9 @@
 PACKAGE = genromfs
 VERSION = 0.5.2
-CC = gcc
-CFLAGS = -O2 -Wall -DVERSION=\"$(VERSION)\"#-g#
-LDFLAGS = -s#-g
+CC ?= gcc
+CFLAGS ?= -O2
+CFLAGS += -Wall -DVERSION=\"$(VERSION)\"#-g#
+LDFLAGS ?= -s#-g
 
 DISTDIR = $(PACKAGE)-$(VERSION)