Otherwise specifying arguments means that you can't effectively build just a single commit or pull request as Jenkins will try and override the start commit.

Make it more consistent with other requirements.

Should be using minimum_mac_os_requirement.rb

Closes Homebrew/homebrew#20047.

Closes Homebrew/homebrew#20212.

/usr/local is in lots of things unrelated to Homebrew so be more specific and look for opt instead.

Fixes Homebrew/homebrew#19460.
Closes Homebrew/homebrew#22375.

Update test to reflect that llvm-gcc should take precedence over
non-Apple GCC.

llvm-gcc should still get priority over non-Apple GCCs.

Fixes Homebrew/homebrew#22424.

Closes Homebrew/homebrew#22388.
Closes Homebrew/homebrew#22430.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Closes Homebrew/homebrew#22339.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

c.f. Homebrew/homebrew#22386.

Still in alpha state.
Handles defaults and merging changes with new versions.
Enable by setting the HOMEBREW_GIT_ETC environment variable.

Closes Homebrew/homebrew#15751.
Closes Homebrew/homebrew#17713.

* Add "--disable-silent-rules" option to autotools-based configure
  options.
  - Also add comments to notify user removing unrecognized configure
    options.
* Add "-DCMAKE_VERBOSE_MAKEFILE=ON" to cmake-based configure options.

Fixes Homebrew/homebrew#22347.

* Fix problem when install exception got swallow and reinstall thinks it
  succeeded.

Allow `build.with?` and similar methods to be used during the test
phase. The BuildOptions (`build`) are initialized with the
`Tab.used_options` unless explicitly overwritten on the command line.

So basically `build.with?` works in `def install` and in `test do` as
one would naively expect. (For the test, gramatically it should be
`built.with?` but who cares)

If a formula was installed `--with-python`, now the tests are also
run `--with-python`. This enables us to use the `python do ... end` in
a meaningful manner.

Using `python do ... end` blocks for the tests, because the bot.brew.sh has
system python per default and we need to set the PYTHONPATH for the test.
Potentially to different values for Python 2.x and 3.x.