wget http://www.ejabberd.im/files/contributions/xmlrpc-1.13-ipr2.tgz
tar -xzvf xmlrpc-1.13-ipr2.tgz
cd xmlrpc-1.13/src
make
cd ../../
cp ebin/*.beam /opt/ejabberd-2.1.6/lib/
ejabberd-2.1.6/ebin