--- ./Makefile.orig
+++ ./Makefile
@@ -11,7 +11,7 @@
 # determination of the actual installation directories.
 # Suggested values are "/usr/local", "/usr", "/pkgs/fdupes-$(VERSION)"
 #
-PREFIX = /usr/local
+PREFIX ?= /usr/local
 
 #
 # When compiling for 32-bit systems, FILEOFFSET_64BIT must be enabled