--- Makefile.orig	2007-10-25 12:17:41.000000000 +0200
+++ Makefile	2007-10-25 12:17:48.000000000 +0200
@@ -12,7 +12,7 @@
     config tests dis88 doselks bootblocks ld86r
 
 ELKSSRC= /usr/src/elks
-PREFIX=  /usr
+PREFIX?=  /usr
 BINDIR=	 $(PREFIX)/bin
 LIBDIR=  $(PREFIX)/lib/bcc
 INCLDIR= $(PREFIX)/lib/bcc