jgart via Guix-patches via schreef op zo 06-02-2022 om 16:50 [-0500]:
> +         (list (string-append "CC=" ,(cc-for-target))
> +               (string-append "PREFIX=" %output))

%output -> #$output (put a ,#~ after #:make-flags).

Maybe likewise in 'install' (YMMV)