diff -Naur slim-1.3.6.orig/panel.cpp slim-1.3.6/panel.cpp
--- slim-1.3.6.orig/panel.cpp	2014-06-18 11:04:57.958630814 -0400
+++ slim-1.3.6/panel.cpp	2014-06-18 11:05:10.675631393 -0400
@@ -11,6 +11,7 @@
 
 #include <sstream>
 #include <poll.h>
+#include <libgen.h>
 #include <X11/extensions/Xrandr.h>
 #include "panel.h"