diff --git a/Makefile b/Makefile
index 72c5a29..26e5465 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,13 @@
-all:	pcsensor
+# Makefile for pcsensor
+
+ifndef ${CC}
+	CC = gcc
+endif
 
-CC = gcc
 CFLAGS = -g -O2 -Wall -lusb-1.0 -I/usr/include/libusb-1.0
 
+all:	pcsensor
+
 pcsensor:	pcsensor.c
 	${CC} ${CFLAGS} -DUNIT_TEST -o $@ $^