+AC_MSG_CHECKING(if struct statvfs.f_fsid is integral type)
+AC_TRY_COMPILE([
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#ifdef HAVE_SYS_MOUNT_H
+#include <sys/mount.h>
+#endif
+#ifdef HAVE_SYS_STATVFS_H
+#include <sys/statvfs.h>
+#endif
+], [struct statvfs s; s.f_fsid = 0;],
+[ AC_MSG_RESULT(yes) ],
+[ AC_MSG_RESULT(no)
+
+ AC_MSG_CHECKING(if fsid_t has member val)
+ AC_TRY_COMPILE([
+#include <sys/types.h>
+#include <sys/statvfs.h>],
+ [fsid_t t; t.val[0] = 0;],
+ [ AC_MSG_RESULT(yes)
+ AC_DEFINE(FSID_HAS_VAL, 1, fsid_t has member val) ],
+ [ AC_MSG_RESULT(no) ])
+
+ AC_MSG_CHECKING(if f_fsid has member __val)
+ AC_TRY_COMPILE([
+#include <sys/types.h>
+#include <sys/statvfs.h>],
+ [fsid_t t; t.__val[0] = 0;],
+ [ AC_MSG_RESULT(yes)
+ AC_DEFINE(FSID_HAS___VAL, 1, fsid_t has member __val) ],
+ [ AC_MSG_RESULT(no) ])
+])
+