Ping, Petr? There may be actually more of the patches needed. See: https://github.com/TigerVNC/tigervnc/tree/master/contrib/fltk I don't know why people from tigervnc never tried to push those patches into fltk upstream. At least Fedora is using them in their fltk, so that gives them some credibility... What is your opinion as maintainer? Should I make submit request adding some of those patches?