--- alexandria-0.6.7.ebuild.orig
+++ alexandria-0.6.7-r99.ebuild
@@ -40,8 +40,8 @@
 }
 
 each_ruby_install() {
-	export DESTDIR="${D}" PREFIX=/usr
-	rake install_package_staging || die
+	export DESTDIR="${D}" PREFIX=/usr RUBYLIBDIR="$(ruby_rbconfig_value 'sitelibdir')"
+	${RUBY} -S rake install_package_staging || die
 }
 
 all_ruby_install() {