Aljosha Papsch schreef op ma 28-06-2021 om 17:22 [+0200]:
> +        (git-reference
> +         (url "https://github.com/apapsch/wondershaper")
> +         (commit "0987dbb0c360184b8aacf391646e19ea9ee78b10")))

Best add a comment like

  ;; Use a fork that allows overriding the configuration file

‘We’ usually try to use upstream versions.

> +       (file-name (git-file-name name version))
> +       (sha256
> +        (base32 "1hyivkpvr5pv8wg64i7vgpxib4allbp4v1ahp3qhc1d88rkw7gjs"))))
> +    (build-system copy-build-system)
> +    (arguments
> +     `(#:install-plan '(("./wondershaper" "./bin/"))
> +       #:phases
> +       (modify-phases %standard-phases
> +         (add-after 'patch-shebangs 'patch-invoked-commands
> +           (lambda* (#:key outputs inputs #:allow-other-keys)
> +             (let* ((out          (assoc-ref outputs "out"))
> +                    (bin          (string-append out "/bin")))
> +               (substitute* (string-append bin "/wondershaper")
> +                 (("^\\s*ip ")
> +                  (string-append (which "ip") " "))

Using (which "blabla") is not correct when cross-compiling, as
"which" looks in $PATH, but "iproute2" (and "kmod") won't be
in $PATH when cross-compiling as they are 'inputs', not 'native-inputs'

You'd need (search-input-file inputs "/bin/ip")
(or maybe "/sbin/ip", I dunno). Actually, search-input-file is
in core-updates, but not yet on 'master', so instead do

  (string-append (assoc-ref inputs "iproute2") "/bin/ip")

or something like that.

Looking at the source code, I see

usage(){
cat  << EOF

so it seems you need to substitute "cat" as well (it is from coreutils).

I'd recommend copying "wondershaper.conf" somewhere
as well, and substituting "/etc/conf.d/wondershaper.conf" and "/etc/systemd/wondershaper.conf"
in 'wondershaper' appropriately, so it will have some defaults.

Greetings,
Maxime.