[gnome-sudoku] configure.ac: guess a reasonable AC_PREREQ

[Michael Catanzaro <mcatanzaro src gnome org>]

commit ae762eada721a726cc4068c26cc1382b6ca0c6f1
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Jan 20 17:24:04 2014 -0600

    configure.ac: guess a reasonable AC_PREREQ

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 343a810..8acdeb5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,3 +1,4 @@
+AC_PREREQ([2.63])
 AC_INIT([GNOME Sudoku], [3.11.3], [https://bugzilla.gnome.org/],
         [gnome-sudoku], [https://wiki.gnome.org/Apps/Sudoku])
 AM_INIT_AUTOMAKE([1.11 no-dist-gzip dist-xz foreign])