diff --git a/Makefile b/Makefile
index 3d89a7a..e69c055 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ INSTALL ?= install
 
 UNAME=$(shell uname)
 SELECTOR:=$(shell if test "${UNAME}" = "Darwin" ; then echo "-f Makefile.OSX" ; fi)
+PREFIX ?= /usr/local
 
 all:
 	$(MAKE) $(SELECTOR) -C src all