You have not mentioned the compiler that you need this for. And as already mentioned by Dennis, it could be sitting there, but not seen by your compiler. Check the path in which has to be located - Read The Manual.

And in any case it is a simple job to write the header files yourself : Just see the header files that are already available for guidance - and write a similiar one for the derivative that you plan to use. The best part of this effort is that in the process you will come to know about the SFRs and other such details;-)


Raghu