The eclass has: if [ -f configure ]; then einstall "$@" || die "einstall failed" However, the build system seems to be clean autotools, requesting 'emake DESTDIR=${D} install' instead.
commit 5ae2aa1fd7f7b0797850b672c8a9d889c84aceee Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Wed Jul 5 15:43:28 2017 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Wed Jul 5 15:47:57 2017 gpe.eclass: Remove dead eclass