Windows install to custom location after building from source

["Martin v. Löwis"]

> Do you mean 3.1a0?  As far as I know, 2.7a0 requires the use
> of the time machine, as it is expected to be 3 months out.

The current trunk calls itself 2.7a0. I think you might be referring
to 3.0a1.

Regards,
Martin