mxcl/homebrew — pull request #9351 by mikemcquaid (2011-12-31 21:11:01+00:00)
Title: Allow keg to match versions using formula/version.

This enables the use of brew link to link specific formulae which
is useful when e.g. switching between multiple versions of the same
library.

This is a bit of a rough hack for now but shouldn't adversely affect other functionality and it's something I find regularly useful when switching between Qt versions for work.

You could use it with qt by typing e.g. `brew link qt/4.7.4`. It should perhaps automatically unlink the other version.

Thoughts?