Install
https://apple.stackexchange.com/questions/102012/openmpi-already-installed-in-os-x
Running openmpi in Xcode
http://wp.yaonan.li/archives/1065
https://stackoverflow.com/questions/12593524/how-to-install-openmpi-for-xcode
Error $TMPDIR too long
echo $TMPDIR
export TMPDIR = /tmp