* Use version compare to only remove kegs with lower version than the
  current one, not higher version which might be from someone's
  branch.
* Do the same for cache cleanup.
  - Be conservative so that if a name detected from cache file is not
    the same as its formula then don't clean it.

Closes Homebrew/homebrew#15914.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Fixes Homebrew/homebrew#16288.

Formula.factory naively assumed that any already-loaded constant
fed into it was a formula, with confusing results when trying to
`brew install` a name from the ruby stdlib.

Fixes Homebrew/homebrew#16284.

Fixes Homebrew/homebrew#16215.

Closes Homebrew/homebrew#16063.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

add missing libcrypto.pc
override broken system libcurl.pc

Closes Homebrew/homebrew#16063.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

`rake profile` will run ruby-prof on the test suite if the ruby-prof gem
is installed.

Closes Homebrew/homebrew#12976.
Closes Homebrew/homebrew#15975.

Ensures the `OBJCXX` environment variable is correctly set. Also adds `OBJC`
and `OBJCXX` to `ENV.remove_cc_etc`.

The [`OBJC`][1] and [`OBJCXX`][2] environment variables should be set along with `CC` and
`CXX`. Some formulae require these to be set in order to properly configure
against Homebrew's compilers.

Fixes Homebrew/homebrew#16029.

  [1]:http://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Objective-C-Compiler.html
  [2]:http://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Objective-C_002b_002b-Compiler.html

haskell-platform falls over badly if VERBOSE is set. Theoretically
this could happen to other packages too. Really it's just less
painful to avoid setting the env var in the first place.

Fixes Homebrew/homebrew#15989.

/cc @samueljohn

Closes Homebrew/homebrew#16008.

Yeah, yeah. The XQuartz/X11 stuff is confusing.

Fixes Homebrew/homebrew#15956.

Closes Homebrew/homebrew#15958.

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

Only limited debugging functionality is available to things that involve
the Readline formula, but it is better than crashing outright.

c.f. Homebrew/homebrew#15776.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#14182.

* lets more text types get picked up
* better filter for `brew list`

Closes Homebrew/homebrew#15961.