iMac-di-sala:node_modules sala$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

Warning: Some directories in /usr/local/share/man aren't writable.
This can happen if you "sudo make install" software that isn't managed
by Homebrew. If a brew tries to add locale information to one of these
directories, then the install will fail during the link step.
You should probably `chown` them:

    /usr/local/share/man/de
    /usr/local/share/man/de/man1
    /usr/local/share/man/es
    /usr/local/share/man/es/man1
    /usr/local/share/man/fr
    /usr/local/share/man/fr/man1
    /usr/local/share/man/hr
    /usr/local/share/man/hr/man1
    /usr/local/share/man/hu
    /usr/local/share/man/hu/man1
    /usr/local/share/man/it
    /usr/local/share/man/it/man1
    /usr/local/share/man/ja
    /usr/local/share/man/ja/man1
    /usr/local/share/man/man3
    /usr/local/share/man/man5
    /usr/local/share/man/man7
    /usr/local/share/man/pl
    /usr/local/share/man/pl/man1
    /usr/local/share/man/pt_BR
    /usr/local/share/man/pt_BR/man1
    /usr/local/share/man/pt_PT
    /usr/local/share/man/pt_PT/man1
    /usr/local/share/man/ro
    /usr/local/share/man/ro/man1
    /usr/local/share/man/ru
    /usr/local/share/man/ru/man1
    /usr/local/share/man/sk
    /usr/local/share/man/sk/man1
    /usr/local/share/man/zh
    /usr/local/share/man/zh/man1

Warning: Broken symlinks were found. Remove them with `brew prune`:
  /usr/local/bin/npm

Warning: "config" scripts exist outside your system or Homebrew directories.
`./configure` scripts often look for *-config scripts to determine if
software packages are installed, and what additional flags to use when
compiling and linking.

Having additional scripts in your path can confuse software installed via
Homebrew if the config script overrides a system or Homebrew provided
script of the same name. We found the following "config" scripts:

  /Library/Frameworks/Python.framework/Versions/2.7/bin/python-config
  /Library/Frameworks/Python.framework/Versions/2.7/bin/python2-config
  /Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7-config

Warning: Your XQuartz (2.7.6) is outdated
Please install XQuartz 2.7.7:
  https://xquartz.macosforge.org

Warning: Python is installed at /Library/Frameworks/Python.framework

Homebrew only supports building against the System-provided Python or a
brewed Python. In particular, Pythons installed to /Library can interfere
with other software installs.

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected header files:
    /usr/local/include/node/android-ifaddrs.h
    /usr/local/include/node/ares.h
    /usr/local/include/node/ares_version.h
    /usr/local/include/node/eio-emul.h
    /usr/local/include/node/ev-emul.h
    /usr/local/include/node/libplatform/libplatform.h
    /usr/local/include/node/nameser.h
    /usr/local/include/node/node.h
    /usr/local/include/node/node_buffer.h
    /usr/local/include/node/node_internals.h
    /usr/local/include/node/node_object_wrap.h
    /usr/local/include/node/node_version.h
    /usr/local/include/node/openssl/opensslconf.h
    /usr/local/include/node/pthread-fixes.h
    /usr/local/include/node/smalloc.h
    /usr/local/include/node/stdint-msvc2008.h
    /usr/local/include/node/tree.h
    /usr/local/include/node/uv-aix.h
    /usr/local/include/node/uv-bsd.h
    /usr/local/include/node/uv-darwin.h
    /usr/local/include/node/uv-errno.h
    /usr/local/include/node/uv-linux.h
    /usr/local/include/node/uv-private/eio.h
    /usr/local/include/node/uv-private/ev.h
    /usr/local/include/node/uv-private/ngx-queue.h
    /usr/local/include/node/uv-private/tree.h
    /usr/local/include/node/uv-private/uv-unix.h
    /usr/local/include/node/uv-private/uv-win.h
    /usr/local/include/node/uv-sunos.h
    /usr/local/include/node/uv-threadpool.h
    /usr/local/include/node/uv-unix.h
    /usr/local/include/node/uv-version.h
    /usr/local/include/node/uv-win.h
    /usr/local/include/node/uv.h
    /usr/local/include/node/v8-debug.h
    /usr/local/include/node/v8-platform.h
    /usr/local/include/node/v8-preparser.h
    /usr/local/include/node/v8-profiler.h
    /usr/local/include/node/v8-testing.h
    /usr/local/include/node/v8-util.h
    /usr/local/include/node/v8.h
    /usr/local/include/node/v8config.h
    /usr/local/include/node/v8stdint.h
    /usr/local/include/node/zconf.h
    /usr/local/include/node/zlib.h

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:

    node