Compilation of gnomemeeting fails due to an error in xdap.c 
(/usr/ports/net/gnomemeeting/work/gnomemeeting-0.98.5/lib/xdap).  Manual 
compilation of this file (with the flags from the makefile) results in the 
following error.

xdap.c: In function `struct xmlDoc * parseonly(char *, xmlEntity * (*)
(void *, const xmlChar *), xmlEntity * (**)(void *, const xmlChar *), 
int)':
xdap.c:162: no match for `xmlSAXHandler & = xmlSAXHandlerV1 &'
/usr/local/include/libxml2/libxml/parser.h:720: candidates are: struct 
_xmlSAXHandler & _xmlSAXHandler::operator =(const _xmlSAXHandler &)

Changing the declaration of sax on line 159 from 
xmlSAXHandler sax; 
to 
xmlSAXHandlerV1 sax; 
allows compilation to occur without any errors.

The libxml2-2.6.60 documentation shows that the global variable 
xmlDefaultSAXHandler has had type changed from xmlSAXHandler to 
xmlSAXHandlerV1.