I get the following message when trying to compile the winsamp.d code: OPTLINK (R) for Win32 Release 8.00.2 Copyright (C) Digital Mars 1989-2009 All rights reserved. http://www.digitalmars.com/ctg/optlink.html winsamp.obj(winsamp) Error 42: Symbol Undefined __moduleUnitTests --- errorlevel 1 Am I missing something?