[git commit] umount: build fix for older glibc

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=31c984dd6904a11b655879b3ad927bd9bf639192
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

Based on a patch by Veli-Pekka Peltola <veli-pekka.peltola at ray.fi>

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 util-linux/umount.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/util-linux/umount.c b/util-linux/umount.c
index 0091097..30bef16 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -30,6 +30,9 @@
 
 #include <mntent.h>
 #include <sys/mount.h>
+#ifndef MNT_DETACH
+# define MNT_DETACH 0x00000002
+#endif
 #include "libbb.h"
 
 #if defined(__dietlibc__)