diff -uNr qemu-3.0.0/os-posix.c qemu-3.0.0.mod/os-posix.c
--- qemu-3.0.0/os-posix.c	2018-08-14 22:10:34.000000000 +0300
+++ qemu-3.0.0.mod/os-posix.c	2018-10-26 16:49:45.286931887 +0300
@@ -36,6 +36,7 @@
 #include "qemu/error-report.h"
 #include "qemu/log.h"
 #include "qemu/cutils.h"
+#include "lockf_implementation.h"
 
 #ifdef CONFIG_LINUX
 #include <sys/prctl.h>