Important: Installing the icecube tools through I3_PORTS is no longer the preferred way for Mac OS. The necessary tools should be installed using homebrew instead.
Unfortunately, the current guides are out of date at the moment. For an update on this, check the IRC chatroom: #icecube
on irc.efnet.net
. A good irc client for Mac OS is Colloquy.
For the meantime, I have prepared another gist guiding through the installation of the icecube simulation software.