Compile XKB keyboard layout descriptions into binary formats.
XKB keyboard description compiler
xkbcomp$ xkbcomp us $DISPLAY$ xkbcomp -I/usr/share/X11/xkb custom.xkb $DISPLAY$ xkbcomp us output.xkm$ xkbcomp -report errors us /dev/null$ xkbcomp -v us $DISPLAY