X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/a005dbcbe34382c2b9cb3075e83aa79ac2e651b4..585ef2eb20f2782c95f28fd84f5855763a5f34f4:/configure.ac

diff --git a/configure.ac b/configure.ac
index 0d8fc488..710453b0 100644
--- 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]),