add :osxfuse symbolic dependency
add ConflictsWithFuseForOsx requirement for osxfuse/fuse4x/fuse4x-kext

Closes Homebrew/homebrew#31975.

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

This is as Python bindings are not build in a way that can have
system or Homebrew Python used interchangeably.

Otherwise super will overwrite @env_proc with the default value.

The method signature of Dependency changed in
1fdf69b90382c43493a5f62f0020729289db6c70, however LD64Dependency was
missed in the update. This resulted in failures in merge_repeats(),
which creates many dependency objects using all three arguments.

- PythonDependency now implies Python 2.7
- PythonDependency now uses brewed Python for bottling
- Use double-quotes everywhere

Closes Homebrew/homebrew#27112.

Returning nil is in the contract of the Comparable module, and a future
version of Ruby will no longer hide this error.

This is so a e.g. brewed Python's modules can be found by superenv.

References Homebrew/homebrew#26229.
Closes Homebrew/homebrew#26197.

* Only set PYTHONPATH for Python 2.
* Set the Python binary for superenv.

References Homebrew/homebrew#24842.
Closes Homebrew/homebrew#26197.
Closes Homebrew/homebrew#26216.
Closes Homebrew/homebrew#26218.
Closes Homebrew/homebrew#26228.

Closes Homebrew/homebrew#26067.

Closes Homebrew/homebrew#24842.

The array elements here are individual arguments to exec, not a string
to pass to the shell; this only appeared to work. In reality, `opam
list` accepts "|" as valid argument, and the command works fine without
grepping the output.

make sure it doesn't actually point to something else

since sitecustomize.py is put in a location found by pypy,
it breaks pypy by setting sys.executable to a path that is definitely wrong,
and may not even exist.

Closes Homebrew/homebrew#24581.

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

Fixes Homebrew/homebrew#24456.

Fixes Homebrew/homebrew#23837.
Fixes Homebrew/homebrew#23866.

Make it more consistent with other requirements.

Should be using minimum_mac_os_requirement.rb

Improve robustness of `PYTHONPATH` by first unsetting it (during
`satisfy`) so that the `PythonInstalled` can get the `python.version`
and so forth and then, after that, setting the `PYTHONPATH` to our
`global_site_packages`.
In the `python_helper` we append to the `PYTHONPATH` so if that var has
been set in a formula, it is respected.
Brew audit does no longer complain about setting the
`ENV['PYTHONPATH']`.

that live in the `libexec` dir of a `Cellar`.

If `depends_on :python => ['modulename', :optional]` then the generated
option is now `--with-python-modulename`, so that it is possible to
actually make depending on python modules optional.
Further, `brew options` becomes more meaningful.

When a formula `depends_on :python` *and* `depends_on :python3`
the `modify_build_environment` method sets the PYTHONPATH
and the Python 3.x requirement then fails because it finds
the sitecustomize.py from Python 2.x in the PYTHONPATH.