--- config/unpack.orig	2019-10-28 14:53:16 UTC
+++ config/unpack
@@ -291,6 +291,9 @@ do
         # cd $ROOT/doc
 	# build $ROOT
 	;;
+      asdl)
+	unpack "Abstract Syntax Description Library" "$ROOT" asdl asdl
+	;;
       *)
 	echo Unknown package: ${i}.
 	echo Trying default method...