--host is the correct option, but the host string "arm" is not valid; it
needs to be a proper triple, something like "x86_64-unknown-linux-gnu".
Either way, ARM was not a supported platform in the 1.4.x release; the
earliest version of Open MPI to support the ARM platform was 1.5.2.
Brian
On 4/25
I think you've reversed the role of host and target then. "host" is the machine
type you are compiling on, and "target" is the machine you are compiling for.
There used to be a wiki page on cross-compiling OMPI, but I couldn't locate it
this morning - I'm sure it's still there, but it is hard to
