diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
index d27fcbf46b..86f0d5c39f 100644
--- a/cmd/zfs/zfs_main.c
+++ b/cmd/zfs/zfs_main.c
@@ -3875,7 +3875,9 @@ static const option_map_t option_map[] = {
 #endif
 	/* Valid options not found in mount(8) */
 	{ MNTOPT_BIND,		MS_BIND		},
+#ifdef MS_REC
 	{ MNTOPT_RBIND,		MS_BIND|MS_REC	},
+#endif
 	{ MNTOPT_COMMENT,	MS_COMMENT	},
 	{ MNTOPT_BOOTWAIT,	MS_COMMENT	},
 	{ MNTOPT_NOBOOTWAIT,	MS_COMMENT	},
diff --git a/lib/libspl/include/sys/mount.h b/lib/libspl/include/sys/mount.h
index f6a67c6a0c..9eb893fe64 100644
--- a/lib/libspl/include/sys/mount.h
+++ b/lib/libspl/include/sys/mount.h
@@ -42,6 +42,15 @@
 #define BLKGETSIZE64		_IOR(0x12, 114, size_t)
 #endif
 
+/*
+ * Some old glibc headers don't correctly define MS_DIRSYNC and
+ * instead use the enum name S_WRITE.  When using these older
+ * headers define MS_DIRSYNC to be S_WRITE.
+ */
+#if !defined(MS_DIRSYNC)
+#define MS_DIRSYNC		S_WRITE
+#endif
+
 #define	MS_USERS	0x40000000
 #define	MS_OWNER	0x10000000
 #define	MS_GROUP	0x08000000