tests: fix for newer Sun Studio C++.

[bison.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 0d8fc488f80f4c89b46cb3d8e98130c224398142..710453b0ce4fe64f53d26121e30c0d7dd8c36c67 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -15,8 +15,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-# We have strange test case titles, so we need Autoconf 2.61 or better.
-AC_PREREQ(2.61)
+# In order for some versions of Sun Studio to compile our C++ test cases
+# correctly, we need Autoconf 2.64 or better to handle the restrict
+# keyword in at least string.h from gnulib.
+AC_PREREQ(2.64)
 
 AC_INIT([GNU Bison],
         m4_esyscmd([build-aux/git-version-gen .tarball-version]),