To Emacs packagers!

[Po Lu]

An alarming number of GNU/Linux distributions are not incorporating
XInput 2 support within their Emacs packages.  Arch Linux and Nix, for
example.

This is typically an error of omission: despite enabling --with-xinput2,
they do not guarantee that the libXi headers are present during the
configuration process.  XInput 2 support remains disabled.

Emacs binaries employing X11 extensions will continue to function on X
servers with those extensions absent, so there is no justification for
intentionally disabling XInput2 support.