Consistent autoconf version

[Dalibor Topic]

On 8/28/13 4:59 PM, Mike Duigou wrote:
> 
> On Aug 28 2013, at 07:42 , Dalibor Topic wrote:
> 
>> current AC_PREREQ is 2.61, fwiw, which is from 2006. Latest Autoconf is 2.69 from 2012, preceded by 2.68 from 2010. 
>>
>> It may be useful to limit the variety of autoconfs in use by setting AC_PREREQ to, say, 2.68. 
> 
> Eeek! 2.61! I believe our current minimum is 2.67 (though 2.68 seems common and reasonable)

Yeah - http://hg.openjdk.java.net/jdk8/jdk8/file/056398db9dcb/common/autoconf/configure.ac
says        33 AC_PREREQ([2.61])
so bumping it to 2.68 (or at least 2.67) may be reasonable.

cheers,
dalibor topic

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