port mpkg and variants: failure

[Jeremy Lavergne]

> I'll probably spend some time on this this week.
> 
> While I'm asking, can you make a mpkg that contains say git-core, which depends upon a ton of stuff, install it, then if zlib is updated, make a pkg for that and install it on top of the zlib pkg embedded in the mpkg?

You can but I just keep updating the mpkg file: all the individual packages within are tracked for upgrade or ignore automatically by Installer.