tt-rss/lib/xmlrpc
..
.empty
filelist.txt
README

Place lib folder from xmlrpc-2.0 here like this:

lib
lib/compat
lib/compat/array_key_exists.php
lib/compat/is_a.php
lib/compat/is_scalar.php
lib/compat/var_export.php
lib/compat/version_compare.php
lib/xmlrpc.inc
lib/xmlrpcs.inc