Nick has a short write-up on setting up a development environment for the MSP430 on OSX.

A series of stale wikis and forum posts complicate the setup for cross-compiling code on OSX Yosemite 10.10.4 and running it on a MSP430G2231 microcontroller. It’s not hard if you know what to do.

Source: Setting up the Launchpad MSP430 development environment on OSX by Nick Carneiro