--- moarvm-2015.06.ebuild       2015-06-20 12:12:17.503488834 +0900
+++ moarvm-2015.06-r1.ebuild    2015-06-20 12:14:06.777884357 +0900
@@ -23,9 +23,9 @@
 S="${WORKDIR}/MoarVM-${PV}"

 src_configure() {
-       perl Configure.pl --prefix="${D}/usr"|| die
+       perl Configure.pl --prefix=/usr || die
 }

 src_install() {
-       emake install
+       emake DESTDIR="${ED}" install
 }