Homebrew/homebrew — pull request #25272 by scpeters (2013-12-17 00:42:26+00:00)
Title: New option for brew install: --dependencies-only

The traditional approach to installing the dependencies of a formula
is the following:

~~~
brew install `brew deps formula`
~~~

This approach ignores any options that are specified in the parent
formula. This pull request adds a --dependencies-only option to
brew install that installs the dependencies of a formula with
optional flags, but returns before installing the parent formula.