On 04/05/15 13:09 +0200, Kalev Lember wrote: >lyx: http://koji.fedoraproject.org/koji/taskinfo?taskID=9651160 It looks like LyX forward-declares std::basic_string, which is (1) undefined behaviour and (2) not going to work now that std::string is really defined as std::__cxx11::basic_string. This should be fixed upstream.