--- slock-0.9.orig/config.mk	2008-07-29 21:22:46.000000000 +0300
+++ slock-0.9/config.mk	2009-01-22 22:33:24.807664254 +0200
@@ -4,10 +4,10 @@
 # Customize below to fit your system
 
 # paths
-PREFIX = /usr/local
+PREFIX = /usr
 
-X11INC = /usr/X11R6/include
-X11LIB = /usr/X11R6/lib
+X11INC = /usr/include/X11
+X11LIB = /usr/lib/X11
 
 # includes and libs
 INCS = -I. -I/usr/include -I${X11INC}