The main fix is I added a chmod u+w . so the ebuild works with FEATURES="userpriv". The tar extracts with no write permission! I also changed "journaling" to the more acceptable spelling. Finally, I made the sed's prettier (added -i.orig). I think it's most important to get the userpriv fixes in the portage tree ASAP.
Created attachment 22401 [details] secure-delete-3.0-r1.ebuild I named this 3.0-r1 to distinguish it, but it does not need a revision bump for this fix.
I added some of your changes -- the userpriv and spelling error. I left the sed -i as it is (I don't know why i.orig is "prettier"). Furthermore, I removed the seds to the Makefile, because they were unnecessary to begin with.