diff -Nur a/cngpijmon/cnijnpr/cnijnpr/cnijnpr.c b/cngpijmon/cnijnpr/cnijnpr/cnijnpr.c
--- a/cngpijmon/cnijnpr/cnijnpr/cnijnpr.c	2011-10-07 01:50:02.000000000 +0200
+++ b/cngpijmon/cnijnpr/cnijnpr/cnijnpr.c	2020-12-29 09:58:42.460048632 +0100
@@ -33,7 +33,9 @@
 #include <signal.h>
 #include <sys/ioctl.h>
 #include <net/if.h>
-#include <sys/sysctl.h>
+#include <linux/sysctl.h>
+#include <sys/types.h>
+#include <unistd.h>
 #include <config.h>
 #include <fcntl.h>