New version for this package hasn't made its way into portage yet. cp cksfv-1.3.8.ebuild cksfv-1.3.9.ebuild works fine. Also, the official url changed. The old one is still working tho, See patch for proposed changes in ebuild.
Created attachment 99250 [details, diff] cksfv-1.3.9.ebuild.patch
thanks, now in portage !