XmlRpc++ - port for Mac OSX (works on Linux, Mac OSX and Windows) - http://sourceforge.net/projects/xmlrpcpp/
Originally source code by Copyright (C) 2002-2003 Chris Morley - cmorley@users.sourceforge.net
Download source from Sourceforge.net here: http://sourceforge.net/projects/xmlrpcpp/files/xmlrpc%2B%2B/
Official site: http://xmlrpcpp.sourceforge.net/
make