diff -Nur sys-freebsd.orig/freebsd-sources/freebsd-sources-9.1_rc3.ebuild sys-freebsd/freebsd-sources/freebsd-sources-9.1_rc3.ebuild
--- sys-freebsd.orig/freebsd-sources/freebsd-sources-9.1_rc3.ebuild	2012-11-06 21:57:50.000000000 +0900
+++ sys-freebsd/freebsd-sources/freebsd-sources-9.1_rc3.ebuild	2012-11-24 06:52:44.000000000 +0900
@@ -2,6 +2,8 @@
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/sys-freebsd/freebsd-sources/freebsd-sources-9.1_rc3.ebuild,v 1.1 2012/11/06 12:57:50 aballier Exp $
 
+EAPI=2
+
 inherit bsdmk freebsd flag-o-matic
 
 DESCRIPTION="FreeBSD kernel sources"
@@ -23,10 +25,7 @@
 
 [[ ${MY_PVR} == "${RV}" ]] && MY_PVR="${MY_PVR}-r0"
 
-src_unpack() {
-	unpack ${A}
-	cd "${S}"
-
+src_prepare() {
 	# This replaces the gentoover patch, it doesn't need reapply every time.
 	sed -i -e 's:^REVISION=.*:REVISION="'${PVR}'":' \
 		-e 's:^BRANCH=.*:BRANCH="Gentoo":' \