diff --git a/Makefile b/Makefile
index 9e1504d..a4f8477 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
-CC = gcc
-CFLAGS = -Wall -fPIC -Ihash -O2
-AR = ar
-ARFLAGS = rcs
+CC ?= gcc
+CFLAGS ?= -Wall -fPIC -Ihash -O2
+AR ?= ar
+ARFLAGS ?= rcs
 
 SRCS = djb2.c
 OBJS = $(SRCS:.c=.o)