This mac has been upgraded in place for many years, and I am sure this is after transferring stuff from a previous mac. There are items in your setup that were built with the 10.8 SDK, so well over a decade ago. xquartz, for example, is from 2012... and almost certainly that versi...
Install the X11 environment by downloading it here http://xquartz.macosforge.org/ Why do I need X11? (It's not even mentioned here: http://blog.teamtreehouse.com/install-node-js-npm-mac). Also, to be honest I haven't even opened Xcode yet, but (although I am not 100%) I think...
MobileMe was replaced by iCloud. Software update functionality was integrated into the App Store. Apple's X11 port for OS X began directing users to the open source XQuartz project. RSS support in Mail and Safari was removed.Apple, Desktop, MacOS, Operating System terms, Social media...