--- backend/src/cnij_backend_common.c	2010-02-23 04:57:49.000000000 +0100
+++ cnij_backend_common.c	2011-11-17 12:59:27.482025762 +0100
@@ -38,6 +38,7 @@
 // CUPS Header
 #include <cups/cups.h>
 #include <cups/ipp.h>
+#include <cups/ppd.h>
 
 // Header file for CANON
 #include "cnij_backend_common.h"

--- cngpijmon/src/bjcupsmon_cups.c	2012-03-17 12:32:43.230805896 +0100
+++ bjcupsmon_cups.c	2012-03-17 12:34:23.179018171 +0100
@@ -18,8 +18,10 @@
 */
 
 /*** Includes ***/
+#define _IPP_PRIVATE_STRUCTURES 1
 #include <cups/cups.h>
 #include <cups/language.h>
+#include <cups/ppd.h>
 #include <sys/types.h>
 #include <unistd.h>

--- cngpij/cngpij/bjcups.c	2012-07-31 05:22:51.613991808 -0400
+++ bjcups.c	 2012-07-31 05:23:14.780658321 -0400
@@ -21,6 +21,7 @@
 #include	<config.h>
 #endif	// HAVE_CONFIG_H
 
+#define _IPP_PRIVATE_STRUCTURES 1
 #include <cups/cups.h>
 #include <cups/language.h>
 #include <cups/ppd.h>