diff -aur cnijfilter-source-3.80_old/backend/src/cnij_backend_common.c cnijfilter-source-3.80_new/backend/src/cnij_backend_common.c
--- cnijfilter-source-3.80_old/backend/src/cnij_backend_common.c	2012-03-29 06:50:27.000000000 +0200
+++ cnijfilter-source-3.80_new/backend/src/cnij_backend_common.c	2013-03-31 19:49:41.335034142 +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 -aur cnijfilter-source-3.80_old/cngpij/cngpij/bjcups.c cnijfilter-source-3.80_new/cngpij/cngpij/bjcups.c
--- cnijfilter-source-3.80_old/cngpij/cngpij/bjcups.c	2012-04-17 05:39:20.000000000 +0200
+++ cnijfilter-source-3.80_new/cngpij/cngpij/bjcups.c	2013-03-31 19:46:55.918366202 +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 -aur cnijfilter-source-3.80_old/cngpijmnt/src/main.c cnijfilter-source-3.80_new/cngpijmnt/src/main.c
--- cnijfilter-source-3.80_old/cngpijmnt/src/main.c	2012-04-26 11:49:34.000000000 +0200
+++ cnijfilter-source-3.80_new/cngpijmnt/src/main.c	2013-03-31 19:43:50.738364780 +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 -aur cnijfilter-source-3.80_old/cngpijmon/src/bjcupsmon_cups.c cnijfilter-source-3.80_new/cngpijmon/src/bjcupsmon_cups.c
--- cnijfilter-source-3.80_old/cngpijmon/src/bjcupsmon_cups.c	2012-05-22 11:49:27.000000000 +0200
+++ cnijfilter-source-3.80_new/cngpijmon/src/bjcupsmon_cups.c	2013-03-31 19:37:24.238361808 +0200
@@ -18,9 +18,11 @@
  */
 
 /*** Includes ***/
+#define _IPP_PRIVATE_STRUCTURES 1
 #include <cups/cups.h>
 #include <cups/ppd.h>
 #include <cups/language.h>
+#include <cups/ppd.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <pwd.h>