J. Brandt Buckley updated November 9, 2010 at 2:06 PM
This is a wiki on how to install OpenMPI 1.5 to your home directory without using sudo. This will also not modify the installed version of GCC.
Open Terminal and type in each command in it's entirety.
This will install it into your ~/bin directory. You'll need to modify your .bashrc, .profile, or .cshrc file respectively in order to be able to execute the binaries without specifying its path.