diff -Naur cnijfilter-source-4.00-1.orig/backend/src/cnij_backend_common.c cnijfilter-source-4.00-1/backend/src/cnij_backend_common.c
--- cnijfilter-source-4.00-1.orig/backend/src/cnij_backend_common.c     2013-07-17 03:33:45.000000000 +0200
+++ cnijfilter-source-4.00-1/backend/src/cnij_backend_common.c  2017-08-29 23:50:32.365429650 +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 cnijfilter-source-4.00-1.orig/cngpij/cngpij/bjcups.c cnijfilter-source-4.00-1/cngpij/cngpij/bjcups.c
--- cnijfilter-source-4.00-1.orig/cngpij/cngpij/bjcups.c        2013-07-17 03:33:45.000000000 +0200
+++ cnijfilter-source-4.00-1/cngpij/cngpij/bjcups.c     2017-08-29 22:41:16.622825513 +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 cnijfilter-source-4.00-1.orig/cngpijmnt/src/main.c cnijfilter-source-4.00-1/cngpijmnt/src/main.c
--- cnijfilter-source-4.00-1.orig/cngpijmnt/src/main.c  2013-07-17 03:33:45.000000000 +0200
+++ cnijfilter-source-4.00-1/cngpijmnt/src/main.c       2017-08-29 22:55:57.105450117 +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>