diff -Nru a/user/drbdadm_adjust.c b/user/drbdadm_adjust.c
--- a/user/drbdadm_adjust.c	2014-08-04 11:36:07.000000000 +0200
+++ b/user/drbdadm_adjust.c	2018-09-24 06:14:09.171453774 +0200
@@ -27,6 +27,7 @@
 #define _FILE_OFFSET_BITS 64
 
 #include <sys/types.h>
+#include <sys/sysmacros.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>
diff -Nru a/user/legacy/drbdadm_adjust.c b/user/legacy/drbdadm_adjust.c
--- a/user/legacy/drbdadm_adjust.c	2014-07-04 14:23:24.000000000 +0200
+++ b/user/legacy/drbdadm_adjust.c	2018-09-24 06:14:57.200768974 +0200
@@ -25,6 +25,7 @@
 #define _GNU_SOURCE
 
 #include <sys/types.h>
+#include <sys/sysmacros.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>
diff -Nru a/user/legacy-84/drbdadm_adjust.c b/user/legacy-84/drbdadm_adjust.c
--- a/user/legacy-84/drbdadm_adjust.c	2014-07-04 14:23:23.000000000 +0200
+++ b/user/legacy-84/drbdadm_adjust.c	2018-09-24 06:15:22.298933688 +0200
@@ -27,6 +27,7 @@
 #define _FILE_OFFSET_BITS 64
 
 #include <sys/types.h>
+#include <sys/sysmacros.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>