If you were trying to compile a Contiki application that targets an MSP430 platform (T-Mote Sky for example) on FreeBSD, you might have noticed that msp430-gcc was removed from the port tree and replaced by gcc-msp430-ti-toolchain. Contiki does not support this newer toolchain so you might find yourself a bit stuck there.
Fortunately you can still access the last version of the msp430-gcc packages from the FreeBSD archives: