--- a/Makefile	Thu Apr 26 11:32:55 2012 +0200
+++ b/Makefile	Fri Apr 27 11:16:15 2012 +0200
@@ -1,6 +1,6 @@
 DESTDIR =
 
-prefix = /usr/local
+prefix?=/usr/local
 sbindir = $(prefix)/sbin
 scripts = wgnd-mkstruct