[PATCH] doc: Add config check for doxygen 1.8.0+.

[Bill Spitzak]

After some tries I found that if you put the word "compare" into the 
search you will find something other than info about how to ask which 
version of autotools you are running.

On 12/04/2014 02:39 AM, sardemff7+wayland at sardemff7.net wrote:
> On 2014-12-03 21:39, Bill Spitzak wrote:
>> Thanks! You know I tried searching for "version" in the autotools
>> documents, but did not find this. That documentation is pretty
>> incomplete.
>
> Not incomplete at all. You should search harder next time. ;-)
> <http://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf.html#index-AS_005fVERSION_005fCOMPARE-1588>
>
>
> I would advise anyone working with Autotools to read the full manual(s)
> at least once to understand the thing better. :-)
>
> Cheers,
>