In the current ALT Linux (Sisyphus, actually) environment including
of <linux/fs.h> leads to "#error Invalid kernel header included in userspace".
So we better include other, non-kernel header with the same definition.

--- dump-0.4b40/dump/main.c.orig	2004-07-05 18:12:45 +0300
+++ dump-0.4b40/dump/main.c	2005-10-21 12:58:23 +0300
@@ -67,7 +67,7 @@
 #include <ext2fs/ext2fs.h>
 #include <sys/stat.h>
 #include <bsdcompat.h>
-#include <linux/fs.h>	/* for definition of BLKFLSBUF */
+#include <sys/mount.h>	/* for definition of BLKFLSBUF */
 #elif defined sunos
 #include <sys/vnode.h>