--- xtables-addons-2.8.ebuild	2015-10-24 20:01:01.000000000 +0300
+++ xtables-addons-2.8.ebuild	2015-11-13 17:48:18.549843917 +0200
@@ -170,7 +170,7 @@
 	set_arch_to_kernel # .. or it'll look for /arch/amd64/Makefile
 	econf --prefix="${EPREFIX}/" \
 		--libexecdir="${EPREFIX}/$(get_libdir)/" \
-		--with-kbuild="${KV_DIR}"
+		--with-kbuild="${KV_OUT_DIR}"
 }
 
 src_compile() {