Hi Joe,

It looks like you are missing OpenMPI.

Are you using the very latest version of sl6.cfg? That's the one here: https://svn.cct.lsu.edu/repos/numrel/simfactory2/trunk/mdb/optionlists/sl6.cfg. At the top of that it gives commands for installing gsl-devel and openmpi-devel. The second of these should provide the necessary OpenMPI.

hwloc selected, but HWLOC_DIR not set. Checking some places...

I was able to get past that by installing hwloc-devel using yum as well.

Unfortunately, the version provided by hwloc-devel is too old. If you use the latest sl6.cfg it will build hwloc instead.

Barry