ok i tried the same thing in root and i get this error. (emulator runs good) but i want to map the keys to the keyboard. the error it gives me is..

"process 4417: D-Bus library appears to be incorrectly set up; failed to read machine uuid: Failed to open "/var/lib/dbus/machine-id": No such file or directory
See the manual page for dbus-uuidgen to correct this issue.
D-bus not built with -rdynamic so unable to print a backtrace
Aborted."

i did however try the fceu on the first page bora2 as bora4 gives me libdus 1-2 error and i was able to map keys with out the error above.