% brew update error: unable to unlink old 'share/man/man1/brew.1' (Permission denied) Error: Failure while executing: git pull --ff --no-rebase --quiet origin refs/heads/master:refs/remotes/origin/master
% 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: /usr/local/share isn't writable. This can happen if you "sudo make install" software that isn't managed by Homebrew. If a formula tries to write a file to this directory, the install will fail during the link step. You should probably change the ownership and permissions of /usr/local/share back to your user account. sudo chown -R $(whoami) /usr/local/share 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 `sudo chown -R $(whoami)` them: /usr/local/share/man /usr/local/share/man/man1 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: autoconf pkg-config Warning: You have uncommitted modifications to Homebrew If this is a surprise to you, then you should stash these modifications. Stashing returns Homebrew to a pristine state but can be undone should you later need to do so for some reason. cd /usr/local/Library && git stash && git clean -d -f Warning: Xcode 7 lacks the 10.10 SDK which can cause some builds to fail. We recommend installing the Command Line Tools with: xcode-select --install to resolve this issue.