diff -Nur cnijfilter-source-3.20-1.orig/backend/src/cnij_backend_common.c cnijfilter-source-3.20-1/backend/src/cnij_backend_common.c
--- cnijfilter-source-3.20-1.orig/backend/src/cnij_backend_common.c	2009-05-27 07:46:41.000000000 +0200
+++ cnijfilter-source-3.20-1/backend/src/cnij_backend_common.c	2012-08-15 15:28:06.172143834 +0200
@@ -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"
diff -Nur cnijfilter-source-3.20-1.orig/cngpij/cngpij/bjcups.c cnijfilter-source-3.20-1/cngpij/cngpij/bjcups.c
--- cnijfilter-source-3.20-1.orig/cngpij/cngpij/bjcups.c	2009-06-11 06:10:32.000000000 +0200
+++ cnijfilter-source-3.20-1/cngpij/cngpij/bjcups.c	2012-08-15 15:28:06.173143833 +0200
@@ -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>
diff -Nur cnijfilter-source-3.20-1.orig/cngpijmon/src/bjcupsmon_cups.c cnijfilter-source-3.20-1/cngpijmon/src/bjcupsmon_cups.c
--- cnijfilter-source-3.20-1.orig/cngpijmon/src/bjcupsmon_cups.c	2009-04-24 08:12:49.000000000 +0200
+++ cnijfilter-source-3.20-1/cngpijmon/src/bjcupsmon_cups.c	2012-08-15 15:28:54.618141976 +0200
@@ -18,8 +18,9 @@
  */
 
 /*** Includes ***/
+#define _IPP_PRIVATE_STRUCTURES 1
 #include <cups/cups.h>
 #include <cups/ppd.h>
 #include <cups/language.h>
 #include <sys/types.h>
 #include <unistd.h>