configure: depend on >=autoconf-2.64

The m4_esyscmd_s macro was introduced in autoconf-2.64.
dequis · Aug 9, 2015 · 7443c55 · 7443c55
1 parent 37aa21a
commit 7443c55
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/configure.ac b/configure.ac
@@ -13,6 +13,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+AC_PREREQ([2.64])
+
 AC_INIT(
     [purple-facebook],
     m4_esyscmd_s([cat VERSION]),