Installing rEFInd on Mac OS X El Capitan

If you're using rEFInd on a Mac (for example, if you're dual-booting or triple-booting with a Linux OS), you may have found rEFInd worked fine with Yosemite but broke with El Capitan. This guide worked for me to get it going again: Installing rEFInd on Mac OS X El Capitan.