Having helped someone build quantum espresso on a Cray XT5 I'm going to have to remember to make a mental note of reading the documentation before I try and build things. Also mpicc/mpif90/mpicxx aren't there in the default software stack. The stack just uses CC=cc, CXX=CC and FC=ftn. These are just wrapper scripts which will also (at least on the ROSA machine) wrap up linking and compiling MPI based programs. It didn't occur to me till I read the documentation!