def METHOD_NAME(program, elem, project_path):
    utils.source_ext = []
    utils.source_ext = ["h"]
    for item in program:
        utils.walk_children(item)
    utils.source_list.sort()
    # print utils.source_list
    for f in utils.source_list:
        path = _make_path_relative(project_path, f)
        Unit = SubElement(elem, 'Unit')
        Unit.set('filename', path.decode(fs_encoding))