--- /dev/null
+# Copyright (C) 2018 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html
+
+from collections import namedtuple
+
+LocalFile = namedtuple("LocalFile", ["dirname", "filename"])
+SrcFile = namedtuple("SrcFile", ["filename"])
+InFile = namedtuple("InFile", ["filename"])
+TmpFile = namedtuple("TmpFile", ["filename"])
+OutFile = namedtuple("OutFile", ["filename"])
+PkgFile = namedtuple("PkgFile", ["filename"])
+
+IcuTool = namedtuple("IcuTool", ["name"])
+SystemTool = namedtuple("SystemTool", ["name"])
+
+DepTarget = namedtuple("DepTarget", ["name"])