Please check whether the use of 'einstall' in this ebuild is actually needed. From a quick glance at the Makefile, it seems to have proper support for DESTDIR. Therefore, if possible please replace the call to 'einstall' with proper 'default' or 'emake DESTDIR="${D}" install'. Thanks.
Austin English fixed this a while ago in -r2. I'm doing some unrelated ebuild cleanup, but you were right, the einstall was pointless.