Link Error with SNN.lib

[Frank Benoit]

While compiling with DMD on windows, i got this:

OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

C:\Programme\dmd\dm\bin\..\lib\SNN.lib(fputwc)  Offset 09AF4H Record
Type 00C3
 Error 1: Previous Definition Different : _putwc
C:\Programme\dmd\dm\bin\..\lib\SNN.lib(fgetwc)  Offset 093A3H Record
Type 00C3
 Error 1: Previous Definition Different : _getwc
--- errorlevel 2
Command C:\Programme\dsss\bin\rebuild.exe returned with code -1, aborting.

What does it mean?
What is SNN.lib?
How can I get it linking?

Frank