Trying on the new Sage Theme

Had to install Yarn (brew install yarn). Already had composer installed. Needed to upgrade my local version of php:

Upgrade to PHP 7 or 7.1 on macOS Sierra or on OSX 10.6 – 10.11

curl -s | bash -s 7.0

Then point to it for php-cli:

Add export PATH=/usr/local/php5/bin:$PATH to .bashrc, then source ~/.bashrc, which is the file named .bashrc in my home directory.

Confirm with php --version.