65         core.source.extend([

    65         core.source.extend([

    66             'unix-system-wall-clock-ms.cc',

    66             'unix-system-wall-clock-ms.cc',

    67             ])

    67             ])

    68     

    68     

    69     headers = bld.create_obj('ns3header')

    69     headers = bld.create_obj('ns3header')

    70     headers.source = [

    71     headers.source = [

    71         'system-wall-clock-ms.h',

    72         'system-wall-clock-ms.h',

    72         'empty.h',

    73         'empty.h',

    73         'callback.h',

    74         'callback.h',

    74         'object-base.h',

    75         'object-base.h',