KDE tap for homebrew
brew tap Anonymooseable/kde (or the appropriate github username if you're tapping a fork...).
It will spit out a few warnings like Warning: Could not tap viteke/kde/ffmpeg over mxcl/master/ffmpeg. These can be safely ignored.
Careful with installing the packages listed: some of the formulae included in homebrew may not be compatible with the KDE software.
Also sorry about my long username that makes typing the install commands a little bit of a pain :D