Benjamin Schieder:

package/base/linux/linux.conf

@@ -27,6 +27,8 @@ case "$xpkg-" in
 	*-source-*)
 		unset splitdesc_dev
 		pkg_linux_mode=source ;;
+	*-src-*)
+		abort "If you want to build a source package, use '${xpkg//src/source}'.";;
 esac
 
 echo_status "Preparing to build a linux kernel $pkg_linux_mode package."