Created attachment 368938 [details, diff] patch to convert ebuild to use python-single-r1.eclass Here's a patch to convert grass ebuild to python-r1 (specifically python-single-r1). I did it locally a while back but never connected with a dev to get it in the tree.
Closing as OBSOLETE - sci-geosciences/grass-7.0.1 has been added to the tree as per bug 514514 and subsequently revbumped. Note that sci-geosciences/grass:6 has been masked and will be removed from the tree in the coming weeks.