Hmm, there should be a different fix. SILE only requires `compat53` on Lua 5.2 or older. It doesn't need it on 5.3 or above \u2014 nor does anything for that matter. That should be fixed in Nix packaging somewhere (note it is kind of silly that setting this to 5.3 works since the library in question is a ship for *less than* 5.3 to shim features.