Update required Autoconf version in INSTALL.

The AC_PREREQ was updated some time ago but the documentation lagged
behind.

diff --git a/INSTALL b/INSTALL
index e4e2f31..b283f94 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -71,7 +71,7 @@ If you are working from a Git tree or snapshot (instead of from a
 distribution tarball), or if you modify the OpenFlow build system, you
 will also need the following software:
 
-    - Autoconf version 2.59 or later (http://www.gnu.org/software/autoconf).
+    - Autoconf version 2.60 or later (http://www.gnu.org/software/autoconf).
 
     - Automake version 1.10 or later (http://www.gnu.org/software/automake).