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.
Fixed. Thanks for reporting. +*espresso-ab-1.0-r1 (31 Aug 2014) + + 31 Aug 2014; Thomas Beierlein <tomjbe@gentoo.org> +espresso-ab-1.0-r1.ebuild: + fix bug 521648 and bump EAPI +