If you get in Homebrew:
Error: An unexpected error occurred during the `brew link` step
The formula built, but is not symlinked into /usr/local
Permission denied @ dir_s_mkdir - /usr/local/XXX
Then run the following to resolve:
sudo chown -R $(whoami) $(brew --prefix)/*
sudo install -d -o $(whoami) -g admin /usr/local/XXX
And either run brew again to install or brew link (whatever package that had the problem)
