[ gpsdrive ] improvement to debian build rules

[Hamish]

> > what's ubuntu's equivalent of /etc/debian_version ?
> >
> > if [ -e /etc/debian_version ] ; then
> >   # is debian
> >   if [ `cat /etc/debian_version` = "4.0" ] ; then
> >     echo "is etch"
> >   fi
> > else
> >   ubuntu...
> > fi
> 
> That was my first guess, but the ubuntu here also has a
> /etc/debian_version File :-(
> 
> 	debian-etch-32: 4.0
> 	debian-lenny-32: 5.0
> 	ubuntu-intrepid-32: lenny/sid
> 	ubuntu-dapper-32: testing/unstable

is there a /etc/ubuntu_version file we could test for first?


Hamish