I was following the pattern of the native package installation recipe (where it doesn't even let you specify a version, which we may want to address separately).  Without a version, it'll just install whatever is the latest in the repo.

Also, I think the version specifiers are a little different; I ended up using `"1:15.b.1-1~ubuntu~lucid"` when I was developing this on Ubuntu.  I'll look further into that to see if it'll take "normal" versions like `"R15B03"`, etc.