Hi For the one that can not wait and want to install therion on the new 10.11 (El Capitan) pre-release. There is a few things that may fail 1. Permission problems with brew. Somehow permissions got changed on my install. The fix was sudo chown -R `whoami` /usr/local cd /usr/local git reset --hard origin/master brew update 2. You need Xcode 7 Beta. Download and install it. Then sudo xcode-select -switch /Applications/Xcode-beta.app/Contents/Developer/ sudo xcodebuild -license 3. Now you should be ready to install therion brew install therion Good luck Chris