diff -uNr i3-4.15/i3-dump-log/main.c i3-4.15.mod/i3-dump-log/main.c
--- i3-4.15/i3-dump-log/main.c	2018-03-10 19:29:14.000000000 +0200
+++ i3-4.15.mod/i3-dump-log/main.c	2018-06-21 19:48:29.556920631 +0300
@@ -27,6 +27,8 @@
 #include <sys/stat.h>
 #include <signal.h>
 
+#include <posix-shm.h>
+
 #include "libi3.h"
 #include "shmlog.h"
 #include <i3/ipc.h>