On 27-07-2022 17:57, Maya via Guix-patches via wrote:
> +  (let ((fprintd-module
> +         #~(string-append #$(fprintd-configuration-fprintd config) "/lib/security/pam_fprintd.so")))

This can be simplified to

    (let ((fprintd-module (file-append (fprintd-configuration-fprintd 
config) "/lib/security/pam_fprintd.so")))

Greetings,
Maxime.