[Distutils] Buildout question

[Scott Robertson]

Is there a way to create a dummy part/recipe that depends on another
part without having to refer to one of the options of other part?
Similar to make's concept of a phony target I suppose.

I'm looking to make a buildout script that looks something like this:

[buildout]
parts = all

[all]
recipe=depends
parts = linux win32 mac

[linux]
recipe=depends
parts=common-part linux-specific-part

[win32]
recipe=depends
parts=common-part win32-specific-part-1 win32-specific-part-2

[mac]
recipe=depends
parts=common-part mac-specific-part

... real part specifications would follow ...



So as you can see, I'm trying to make a buildout script that will
build three different variations of the same project for the three
major platforms  Windows, Mac and Linux from the same build machine.

Depending on the platform I'm building for I may build  parts in my
buildout file. Ideally from the command line I'd like to do something
like this.

$ buildout install linux

or

$ buildout install mac
or

$ buildout install win32

or
$ buildout install all


Is this possible to do in recipe or is there some other mechanism I
could use to do this dependency? The refering to a variable of another
part sort of works for this, but I think it would be easier to read
(and less typing) if I could epxlicitly declare that a given part
depends on another.