darwin and expat

I'm trying to build expat on Darwin in a cross platform project. Since
I'm further wrapping expat with a DOM, I'm trying to keep my wrapping
code platform independent and it's all Unicode. I have XML_UNICODE and
XML_UNICODE_WCHAR_T macros defined and it appears that the file
xmlwf/unixfilemap.c does not implement a wchar_t flavor of the filemap()
function. Is there something I'm missing or have configured incorrectly
or is it a simple matter of functionality that needs implemented?

 

Joe