Almost! Instead of "arm64-linux-gnu" it should be "aarch64-linux-gnu" in debian/rules:
-ifeq ($(DEB_HOST_GNU_TYPE),arm64-linux-gnu) +ifeq ($(DEB_HOST_GNU_TYPE),aarch64-linux-gnu) Thanks! -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

