how to use different distfiles for py2 and py3?

[Thomas Klausner <tk%giga.or.at@localhost>]

Hi!

py-dateutil-2.0 is out, but it only supports python-3.x. The author
says that python-2.x users should stay at the previous version 1.5,
the current pkgsrc version.

I'm not sure how to get py-dateutil-2.0 into pkgsrc. If I make it a
separate package, all packages depending on it will have to use
separate DEPENDS lines for py2 and py3.

If on the other hand I set MASTER_SITES and DISTFILES depending on
PYPKGPREFIX, the version number of the package will differ between py2
and py3 and I expect that bulk builds won't like that.

Ideas?
 Thomas