Hi, i just added

#include <mmsystem.h>

and now i am getting heapssss of link errors?

MainFrm.obj : error LNK2005: _IID_IAudioExternalSynthesizer already defined in in6.obj
MainFrm.obj : error LNK2005: _IID_ITTSExternalSynthesizerA already defined in in6.obj
MainFrm.obj : error LNK2005: _IID_ITTSExternalSynthesizerW already defined in in6.obj
MainFrm.obj : error LNK2005: _CLSID_SynthEngineEnumerator already defined in in6.obj
MainFrm.obj : error LNK2005: _CLSID_SynthEngine already defined in in6.obj
MainFrm.obj : error LNK2005: _CLSID_SynthAudioDest already defined in in6.obj
MainFrm.obj : error LNK2005: _IID_IAudioTel already defined in in6.obj
MainFrm.obj : error LNK2005: _IID_IAudioSourceLog already defined in in6.obj
MainFrm.obj : error LNK2005: _IID_ISTLog already defined in in6.obj

and more?

why is it?
how should i resolve it?