# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#serial 2
+#serial 4
-AC_DEFUN([AX_ASSERT],[
+AC_DEFUN([AX_ASSERT],
+ [AC_PREREQ([2.63])dnl
AC_REQUIRE([AX_DEBUG])
AC_ARG_ENABLE([assert],
[AS_HELP_STRING([--enable-assert],