Compiling (NS/Cocoa) Emacs on OSX with SVG support
The installation of the Emacs latest version (25.0.50) works fine using this command:
brew install emacs --HEAD --use-git-head --cocoa --with-gnutls --with-rsvg --with-imagemagick
I was unable to get this working, and instead went with the Emacs Mac Port
Turns out it's much better than I'd thought.