diff -Naur a/backend/src/cnij_backend_common.c b/backend/src/cnij_backend_common.c
--- a/backend/src/cnij_backend_common.c  2010-02-23 04:57:49.000000000 +0100
+++ b/backend/src/cnij_backend_common.c  2012-07-31 13:20:51.050057184 +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 -Naur a/cngpij/cngpij/bjcups.c b/cngpij/cngpij/bjcups.c
--- a/cngpij/cngpij/bjcups.c  2010-03-15 09:48:58.000000000 +0100
+++ b/cngpij/cngpij/bjcups.c  2012-07-31 13:20:58.126523983 +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 -Naur a/cngpijmon/src/bjcupsmon_cups.c b/cngpijmon/src/bjcupsmon_cups.c
--- a/cngpijmon/src/bjcupsmon_cups.c  2010-05-11 10:49:30.000000000 +0200
+++ b/cngpijmon/src/bjcupsmon_cups.c  2012-07-31 13:20:58.129857221 +0200
@@ -18,8 +18,9 @@
  */

 /*** Includes ***/
+#define _IPP_PRIVATE_STRUCTURES 1
 #include <cups/cups.h>
 #include <cups/ppd.h>
 #include <cups/language.h>