--- /usr/portage/app-emulation/virtualbox-guest-additions/virtualbox-guest-additions-4.1.18.ebuild	2012-07-25 02:14:27.000000000 +0000
+++ /usr/portage/app-emulation/virtualbox-guest-additions/virtualbox-guest-additions-4.1.18.ebuild	2012-07-25 02:19:08.000000000 +0000
@@ -81,6 +81,9 @@
 				"${WORKDIR}/${mdir}/${vboxheader}"
 		done
 	done
+
+	# Fix split kernels includes
+	sed -i 's@\<kernelpath\>\(.*/generated\>\)@VBOX_LINUX_SRC\1@' "${S}"/Config.kmk
 }
 
 src_configure() {
@@ -90,6 +93,7 @@
 		--disable-sdl-ttf \
 		--disable-pulse \
 		--disable-alsa \
+		--with-linux=${KV_OUT_DIR} \
 		--build-headless || die "configure failed"
 }