bug#54061: thermald-2.4.7 build fail following upower update to 0.99.15

[Nicolas Goaziou]

Hello,

Maxime Devos <maximedevos@telenet.be> writes:

>       `(#:configure-flags
> -       (let ((out (assoc-ref %outputs "out")))
> -         (list (string-append "--with-dbus-sys-dir="
> -                              out "/etc/dbus-1/system.d")
> -               "--localstatedir=/var"))
> +       ,#~(list (string-append "--with-dbus-sys-dir="
> +                               #$output "/etc/dbus-1/system.d")
> +                "--localstatedir=/var")

The patches look good, but I'm not sure it is a good idea to publicize
the unquote+ungexp, alias ",#~", style. IIUC, in
<https://guix.gnu.org/fr/blog/2021/the-big-change/> there's some
reasoning against the abuse of unquoting. This kind of defeat the
simplicity introduced with G-expressions. So, I would favor writing:

 (list
  #:configure-flags
  #~(list ...))

WDYT?

Regards,
-- 
Nicolas Goaziou