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.

If you have relocated your HOMEBREW_CACHE under HOMEBREW_PREFIX,
then don't show these files as "unbrewed".

The new formula debugger users continuations to jump back up the stack,
and thus anything that has the potential to be executed twice (i.e.
ensure blocks) needs to to be essentially idempotent.

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

Enumerable#one? is not available under Ruby 1.8.6. Further, we really
want #any? here, as setting both HOME and CURL_HOME can trigger a false
negative.

Fixes Homebrew/homebrew#15883.

Having a third-party `fuse.pc` file will conflict with the `fuse4x` formula.

stdenv already works as Contributions/cmds is in the path already.

This is safe to do because OS X already has git and svn in the PATH if you have the CLT installed. So we should definitely ensure we use the right versions.

Fixes Homebrew/homebrew#15783.

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

Fixes Homebrew/homebrew#14815.