--- /usr/portage/x11-drivers/xf86-video-virtualbox/xf86-video-virtualbox-4.1.12.ebuild	2012-07-05 03:24:57.000000000 +0000
+++ /usr/portage/x11-drivers/xf86-video-virtualbox/xf86-video-virtualbox-4.1.12.ebuild	2012-07-05 03:25:31.000000000 +0000
@@ -94,6 +94,7 @@
 		--disable-sdl-ttf \
 		--disable-pulse \
 		--disable-alsa \
+		--with-linux=${KV_OUT_DIR} \
 		--build-headless || die "configure failed"
 		source ./env.sh
 }