Well, the Cool VL Viewer should work in
any 4 years or less old Linux distribution (the requirements being related to the glibc and libstdc++ minimum version), as long as it is launched under X11 (I make no guarantee about and won't support Xwayland sessions, and Wayland-alone is of course incompatible).
I have been
extremely careful not to require exotic stuff, or components that may not be present in
all distros (e.g.
systemd, GTK, XDG stuff like
xdg-desktop-portal), which ensures the widest possible compatibility.