+#if HAVE_SYS_MNTENT_H
+/* This is to get MNTOPT_IGNORE on e.g. SVR4. */
+# include <sys/mntent.h>
+#endif
+
+#if defined (MNTOPT_IGNORE) && defined (HAVE_HASMNTOPT)
+# define MNT_IGNORE(M) hasmntopt ((M), MNTOPT_IGNORE)
+#else
+# define MNT_IGNORE(M) 0
+#endif
+