why?user@ubuntu-mate-laptop:~/Bin/FreeBASIC-1.08.1-ubuntu-20.04-x86_64/examples/GUI/IUP$ ./buttons
(buttons:56158): Gtk-ERROR **: 00:12:56.188: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported
Trace/breakpoint trap (core dumped)
i have installed iup-3.30_Linux54_64_lib