Update m4

[m6w6/libmemcached] / m4 / ax_debug.m4

diff --git a/m4/ax_debug.m4 b/m4/ax_debug.m4
index d2e9a480f7e3737d2c1ed6408653e7d09816a996..d83a87e9cfbfa8d559336b904b0403a6bed5f481 100644 (file)
--- a/m4/ax_debug.m4
+++ b/m4/ax_debug.m4
@@ -43,9 +43,10 @@
 #  (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 1
+#serial 3
 
-AC_DEFUN([AX_DEBUG],[
+AC_DEFUN([AX_DEBUG],
+    [AC_PREREQ([2.63])dnl
     AC_ARG_ENABLE([debug],
       [AS_HELP_STRING([--enable-debug],
         [Add debug code/turns off optimizations (yes|no) @<:@default=no@:>@])],[