Clifford Wolf:

package/base/linux/linux.conf

@@ -24,8 +24,11 @@ pkg_linux_mode=image
 pkg_linux_cross=""
 
 case "$xpkg-" in
-	*-header-*) pkg_linux_mode=header ;;
-	*-source-*) pkg_linux_mode=source ;;
+	*-header-*)
+		pkg_linux_mode=header ;;
+	*-source-*)
+		unset splitdesc_dev
+		pkg_linux_mode=source ;;
 esac
 
 echo_status "Preparing to build a linux kernel $pkg_linux_mode package."