diff --git a/Makefile b/Makefile
index 7141deb..8e4783b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # Makefile for postplug
-# Copyright (C) 2004-2005 by Silvan Calarco <silvan.calarco@qilinux.it>
+# Copyright (C) 2004-2015 by Silvan Calarco <silvan.calarco@qilinux.it>
 # Copyright (C) 2004-2007 by Davide Madrisan <davide.madrisan@gmail.com>
 
 include VERSION
@@ -10,6 +10,7 @@ prefix = /usr
 exec_prefix = $(prefix)
 sysconfdir = /etc
 bindir = $(exec_prefix)/bin
+libdir := $(prefix)/lib
 sbindir = $(exec_prefix)/sbin
 sbin = /sbin
 mandir = $(prefix)/share/man
@@ -106,6 +107,7 @@ install-scripts: $(pck_scripts)
 	$(INSTALL_DIR) $(DESTDIR)$(sbin)
 	$(INSTALL_SCRIPT) $^ $(DESTDIR)$(sbin)
 	$(INSTALL_SCRIPT) scripts/update-alternatives-set-dri $(DESTDIR)$(sbin)
+	sed -i "s|@LIBDIR@|$(libdir)|" $(DESTDIR)$(sbin)/update-alternatives-set-dri
 
 install-programs: install-plugins install-scripts install-defs
 	@echo "installing $(PACKAGE)..."
diff --git a/scripts/update-alternatives-set-dri b/scripts/update-alternatives-set-dri
index ad66b64..58fc2a8 100755
--- a/scripts/update-alternatives-set-dri
+++ b/scripts/update-alternatives-set-dri
@@ -1,4 +1,4 @@
 #!/bin/bash
 # Set DRI alternatives for Mesa/Xorg
-update-alternatives --set libglx.so /usr/lib64/xorg/modules/glx-dri/libglx.so
-update-alternatives --set libGL.so.1 /usr/lib64/mesa/libGL.so.1.2
+update-alternatives --set libglx.so @LIBDIR@/xorg/modules/glx-dri/libglx.so
+update-alternatives --set libGL.so.1 @LIBDIR@/mesa/libGL.so.1.2