-AC_MSG_CHECKING(where to find a working nbd.h)
-AC_TRY_COMPILE([#define u32 int
-#define u64 int
-#define __be32 int
-#define __be64 int
-#include "nbd.h"
-#ifdef __GNUC__
-#define UNUSED __attribute__((__unused__))
-#else
-#define UNUSED
-#endif
-],
-[int UNUSED foo=NBD_CMD_DISC],
- [AC_DEFINE(NBD_H_LOCAL, 1, Set to 1 if a (2.6) nbd.h can be found in the current directory)
- NBD_H='"nbd.h"'],
- AC_TRY_COMPILE([#define u32 int
-#define u64 int
-#define __be32 int
-#define __be64 int
-#include <linux/nbd.h>
-#ifdef __GNUC__
-#define UNUSED __attribute__((__unused__))
-#else
-#define UNUSED
-#endif
- ],
-[int UNUSED foo=NBD_CMD_DISC],
- [AC_DEFINE(NBD_H_LINUX, 1, Set to 1 if a (2.6) nbd.h can be found in the linux directory in the search path)
- NBD_H='<linux/nbd.h>'],
- AC_TRY_COMPILE([#include <linux/nbd.h>
-#ifdef __GNUC__
-#define UNUSED __attribute__((__unused__))
-#else
-#define UNUSED
-#endif
- ],
- [int UNUSED foo=NBD_CMD_DISC],
- [AC_DEFINE(NBD_H_LINUX, 1, Set to 1 if a (2.6) nbd.h can be found in the linux directory in the search path)
- NBD_H='<linux/nbd.h>'],
- AC_MSG_ERROR(Could not find an nbd.h from 2.6 or above.)
- )
- )
-)
-if test -f nbd.h
-then
- if test "$NBD_H" = '<linux/nbd.h>'
- then
- AC_MSG_WARN([there is a local nbd.h, but it is from the 2.4-series of kernels. Using the system-provided, working, nbd.h])
- fi
-fi
-AC_MSG_RESULT($NBD_H)