brew-doctor

$ 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Warning: Your XQuartz (2.7.7) is outdated
Please install XQuartz 2.7.8:
  https://xquartz.macosforge.org

Warning: /Library/Frameworks/libcurl.framework detected
This can be picked up by CMake's build system and likely cause the build to
fail. You may need to move this file out of the way to compile CMake.

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

Unexpected dylibs:
    /usr/local/lib/libwkhtmltox.0.12.2.dylib

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/wkhtmltox/image.h
    /usr/local/include/wkhtmltox/pdf.h

Warning: Broken symlinks were found. Remove them with `brew prune`:
    /usr/local/bin/apm
    /usr/local/bin/atom
    /usr/local/bin/git-media
    /usr/local/bin/github