LINK error: LNK2020 - Should I link the unmanaged libraries <math.h>, <stdio.h> ?

[Eliseu_CEL]

I am developing a Managed class that is a wrapper for other unmanaged classes that uses the old C++ libraries: <math.h>, <stdio.h>,<string.h>, <stdlib.h>.

My little project compiles all right, but I get this LINK error:

LNK2020: unresolved token (0A000019) ??_7type_info@@6B@

I did not link this files (<math.h>, <stdio.h>,…). Do I need to do this? If I need, how I can do that?

Thanks in advance.