see http://www.busybox.net/lists/busybox/2004-December/013276.html
and http://bugs.openembedded.org/show_bug.cgi?id=657

--- busybox-1.01/libbb/loop.c	2006/03/13 22:18:47	1.1
+++ busybox-1.01/libbb/loop.c	2006/03/13 22:19:57
@@ -19,6 +19,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+#include <linux/types.h>
 #include <stdio.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -30,7 +31,6 @@
 /* Grumble...  The 2.6.x kernel breaks asm/posix_types.h
  * so we get to try and cope as best we can... */
 #include <linux/version.h>
-#include <asm/posix_types.h>
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
 #define __bb_kernel_dev_t   __kernel_old_dev_t