[xml] libxml: disable file handling functionality?

[markus forrer gmx ch]

I'd like to use the libxml library without file handling (just reading and parsing XML data from memory). 
Because of the file access functionionality of libxml (function 'open') I've got a problem to build the 
library (have a look to thread 'undefined reference to 'open' in the mailing list).

Is it possible to disable the file handling functionality of libxml?

Thanks for any hints.

Best regards.
Markus