https://bugs.gentoo.org/616758
--- a/user/shared/shared_tool.c
+++ b/user/shared/shared_tool.c
@@ -8,6 +8,7 @@
 #define _FILE_OFFSET_BITS 64
 
 #include <sys/types.h>
+#include <sys/sysmacros.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
--- a/user/v83/drbdadm_adjust.c
+++ b/user/v83/drbdadm_adjust.c
@@ -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>
--- a/user/v84/drbdadm_adjust.c
+++ b/user/v84/drbdadm_adjust.c
@@ -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>
--- a/user/v9/drbdadm_adjust.c
+++ b/user/v9/drbdadm_adjust.c
@@ -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>