I have explained in a previous post how the old version of msp430-gcc is getting depreciated everywhere. Now even the binaries are getting bit rot. So if msp430-gcc complains on FreeBSD that libmpfr.so.4 is missing, here is a quick dirty hack that you can use:
ln -s libmpfr.so.6 libmpfr.so.4
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: