use compatible check for dot version

[Pekka Paalanen]

On Tue, 31 Mar 2015 20:52:48 +0200
Hector Oron <hector.oron at gmail.com> wrote:

> Hello,
> 
> 2015-03-31 20:49 GMT+02:00 Bill Spitzak <spitzak at gmail.com>:
> > I can't get either of those to work, but how about this:
> >
> >  dot_version=`$DOT -V 2>&1 | $GREP -o '[0-9]*\.[0-9]*\.[0-9]*'`
> 
> That one also works for me.

Ok, so will someone send a proper patch with that and we can assume the
original patch superseded?


Thanks,
pq