Set a minimum automake version

* configure.ac: Require automake 1.11 (fairly arbitrarily).
* autogen.sh (automake_min): Get it from configure.ac.

ChangeLog

+2012-08-07  Glenn Morris  <rgm@gnu.org>
+
+	* configure.ac: Require automake 1.11 (fairly arbitrarily).
+	* autogen.sh (automake_min): Get it from configure.ac.
+
 2012-08-06  Glenn Morris  <rgm@gnu.org>
 
 	* configure.ac (BROKEN_GETWD) [unixware]: New define.

autogen.sh

@@ -36,8 +36,9 @@ progs="autoconf automake"
 ## Minimum versions we need:
 autoconf_min=`sed -n 's/^ *AC_PREREQ(\([0-9\.]*\)).*/\1/p' configure.ac`
 
-## FIXME how to determine this from the sources?
-automake_min=1.11
+## This will need improving if more options are ever added to the
+## AM_INIT_AUTOMAKE call.
+automake_min=`sed -n 's/^ *AM_INIT_AUTOMAKE(\([0-9\.]*\)).*/\1/p' configure.ac`
 
 
 ## $1 = program, eg "autoconf".

configure.ac

@@ -26,7 +26,8 @@ AC_INIT(emacs, 24.1.50)
 AC_CONFIG_HEADER(src/config.h:src/config.in)
 AC_CONFIG_SRCDIR(src/lisp.h)
 AC_CONFIG_AUX_DIR(build-aux)
-AM_INIT_AUTOMAKE
+dnl Fairly arbitrary, older versions might work too.
+AM_INIT_AUTOMAKE(1.11)
 
 dnl Support for --program-prefix, --program-suffix and
 dnl --program-transform-name options