diff --git a/makefile b/makefile
index c9f21d9..8b7b479 100644
--- a/makefile
+++ b/makefile
@@ -1,10 +1,12 @@
+PREFIX ?= /usr/local
+
 cshatag:
 	gcc cshatag.c -l crypto -o cshatag
 	
 install:
-	cp -v cshatag /usr/local/bin
-	mkdir -v /usr/local/share/man/man1 2> /dev/null || true
-	cp -v cshatag.1 /usr/local/share/man/man1
+	cp -v cshatag ${PREFIX}/bin
+	mkdir -v ${PREFIX}/share/man/man1 2> /dev/null || true
+	cp -v cshatag.1 ${PREFIX}/share/man/man1
 	
 clean:
-	rm -f cshatag
\ No newline at end of file
+	rm -f cshatag