Official Website
http://sourceforge.net/apps/mediawiki/mspgcc/index.php?title=MSPGCC_Wiki
Ubuntu
Install libncurses
$ sudo apt-get install libncurses5-dev
Install msp430 toolchain
$ sudo apt-get install msp430-libc mspdebug msp430mcu binutils-msp430 gcc-msp430 gdb-msp430
[ia32-libs]
Cygwin
Make sure rpm package is installed (Run setup again, under util if rpm cannot be found)