Define WINEPREFIX if it doesn't exist

[Dmitry Timoshkov]

"Alexandre Julliard" <julliard at winehq.org> wrote:

> >     Define WINEPREFIX if it doesn't exist.
> 
> Why do you need that?

I have several Wine trees locally, and start up scripts some of them
set WINEPREFIX to a non default value. In order to avoid setting it
in my ~/.profile I'd prefer that each Wine start up script sets this
either to each own unique value or, if it has no special preferences,
set it to the default one.

-- 
Dmitry.