diff -p -up xpp-1.5/xpp.h.cups xpp-1.5/xpp.h
--- xpp-1.5/xpp.h.cups	2012-12-21 16:09:30.798407805 +0100
+++ xpp-1.5/xpp.h	2012-12-21 16:09:48.908231581 +0100
@@ -36,6 +36,7 @@
 #include <cups/cups.h>
 #include <cups/ipp.h>
 #include <cups/language.h>
+#include <cups/ppd.h>
 #include <FL/Fl.H>
 #include <FL/Fl_Window.H>
 #include <FL/Fl_Box.H>