How to avoid “cannot load such file — utils/popen” from homebrew on OSX
Original Answer The problem mainly occurs after updating OS X to El Capitan (OS X 10.11) or macOS Sierra (macOS 10.12). This is because of file permission issues with El Capitan’s or later macOS’s new SIP process. Try changing the permissions for the /usr/local directory: $ sudo chown -R $(whoami):admin /usr/local If it still doesn’t … Read more