diff -uNr i3-4.15/src/main.c i3-4.15.mod/src/main.c
--- i3-4.15/src/main.c	2018-03-10 19:29:14.000000000 +0200
+++ i3-4.15.mod/src/main.c	2018-06-21 19:48:29.576920631 +0300
@@ -21,6 +21,8 @@
 #include <libgen.h>
 #include "shmlog.h"
 
+#include <posix-shm.h>
+
 #ifdef I3_ASAN_ENABLED
 #include <sanitizer/lsan_interface.h>
 #endif