Tobias Geerinckx-Rice 写道：
> Interesting here is that it's looking in …-cups-2.3.3 where I 
> believe
> it should look in …-cups-server-bin instead.

Specifically through the standard $PATH mechanism:

  …
  envp[10]="PATH=/gnu/store/…-cups-server-bin/lib/cups/filter:…"
  …

(from /var/log/cups/error_log).

Kind regards,

T G-R