1. I have one of the oldest living IBM Series M keyboards with the
original IBM APL2 keycaps.
2. I use APL a lot.
3. The APL support in /usr/share/X11/xkb/ doesn't include support for
So I patched /usr/share/X11/xkb/symbols/apl and
/usr/share/X11/xkb/rules/evdev.extras.xml to provide that support. If
anyone is interested, I'll be glad to provide the patches. (They're
against Fedora 33.)