diff --git a/frotz/Makefile b/frotz/Makefile
index e56f6e6..7815b08 100644
--- a/frotz/Makefile
+++ b/frotz/Makefile
@@ -1,8 +1,8 @@
 # Define path for ar
-AR = /usr/bin/ar
+AR ?= /usr/bin/ar

 # Define path for ranlib
-RANLIB = /usr/bin/ranlib
+RANLIB ?= /usr/bin/ranlib

 # Define your C compiler.  I recommend gcc if you have it.
 # MacOS users should use "cc" even though it's really "gcc".