Index: src/gholder.c
--- src/gholder.c.orig	2020-11-08 03:25:14.000000000 +0100
+++ src/gholder.c	2020-11-09 09:13:30.447011000 +0100
@@ -32,6 +32,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
