Hi Damian,
On a related note, two Sourcery Institute developers have attempted to edit the GCC build system to make the downloading and building of OpenCoarrays automatically part of the gfortran build process. Neither developer succeeded.
We addressed integrating OpenCoarray into the gcc source tree at the recent Gcc summit during the gfortran BoF session. Feedback from people working for big Linux distributions was that they would prefer to package OpenCoarrays as a separate library. (They also mentioned it was quite hard to build.) Maybe these people could use some help from you. Regards Thomas