use compatible check for dot version

[Hector Oron]

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.

Thanks
-- 
 Héctor Orón  -.. . -... .. .- -.   -.. . ...- . .-.. --- .--. . .-.