[firedrake] Firedrake Installation on Mac OS

[Lawrence Mitchell]

Hi Anna,

> On 23 Nov 2014, at 13:21, Anna Kalogirou <A.Kalogirou at leeds.ac.uk> wrote:
> 
> I re-installed PETSc with the new configure option and the PyOP2 tests now run. With backend=opencl the tests were successful, but about 600 fail with backend=openmp. They all seem to have the same error, see below.

Openmp failures are expected on Mac OS, since the compiler has no openmp support. I will update the make file and docs appropriately. 

Lawrence