--- cnijfilter-source-3.40-1/backend/src/cnij_backend_common.c	2010-02-23 03:57:49.000000000 +0000
+++ cnijfilter-source-3.40-1.new/backend/src/cnij_backend_common.c	2017-03-21 21:20:59.335056912 +0000
@@ -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"
--- cnijfilter-source-3.40-1/cngpij/cngpij/bjcups.c	2010-03-15 08:48:58.000000000 +0000
+++ cnijfilter-source-3.40-1.new/cngpij/cngpij/bjcups.c	2017-03-21 21:30:56.704821837 +0000
@@ -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>
--- cnijfilter-source-3.40-1/cngpijmon/src/bjcupsmon_cups.c	2010-05-11 09:49:30.000000000 +0100
+++ cnijfilter-source-3.40-1.new/cngpijmon/src/bjcupsmon_cups.c	2017-03-21 21:28:31.494876258 +0000
@@ -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>
 #include <pwd.h>
--- cnijfilter-source-3.40-1/cngpijmon/cnijnpr/cnijnpr/cnijnpr.c     2010-03-11 01:33:21.000000000 +0000
+++ cnijfilter-source-3.40-1.new/cngpijmon/cnijnpr/cnijnpr/cnijnpr.c     2020-11-15 14:45:55.968773500 +0000
@@ -33,7 +33,7 @@
 #include <signal.h>
 #include <sys/ioctl.h>
 #include <net/if.h>
-#include <sys/sysctl.h>
+#include <linux/sysctl.h>
 #include <config.h>
 
 #include <dlfcn.h>