Using portmaster with different PYTHON_VERSION

[Klaus T. Aehlig]

> The reason is because PORTSDIR has not been defined at this point.
> The PORTSDIR variable is defined in /usr/ports/Mk/bsd.port.mk. Also
> bsd.port.mk  doesn't get included until after the master port's
> Makefile gets included.

Oh yes, you're absolutely right. I completely forgot that bsd.port.mk
ist not yet included at that point. Thank you very much for your
explanation! 

Sorry again, for the annoying question and best regards,

Klaus