The files attached below compiles but linkage fails:

C:\Upload> dmc -cpp problem.cpp
link problem,,,user32+kernel32/noi;
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

problem.obj(problem)
 Error 42: Symbol Undefined ??6@YAAAVostream@@AAV0@ABV?
$stack@H@@@Z (ostream &cd
ecl <<(ostream &,stack<int > const &))

--- errorlevel 1

Any help or suggestions are welcome.

Thanks,
Edward