I've finally applied the patch. http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=commit;h=9face836
I made a few comment tweaks and added some dependencies for the heap module. I also removed the xmemcoll0() calls which are separate to this concurrent functionality. I will add those back in Chen's name after updating to the latest gnulib. Thanks everyone for their work on this! Pádraig.
