Dear Maintainer,
The man page and source for the dotfile .XCompose says the file should live in
the home directory of a user. The XDG Base Directory Specification suggests
config files should live in `${XDG_CONFIG_HOME}/XCompose` or
`${XDG_CONFIG_HOME}/XCompose/config`.
The source for locating the XCOMPOSEFILE and man page source look approachable:
I'm very willing to undertake this bug myself.
I'm a new contributor to Debian so I would appreciate any advice you may be willing to provide.
I suspect this is an issue that should be solved upstream of Debian, (if accepted here).
I've done a cursory pass on libx11's upstream bug tracker and didn't find anything relevant.