Allan Adair schreef op ma 23-05-2022 om 21:44 [+0200]:
> (define-public libvirt-with-qemu-bridge-helper
>   (package
>     (inherit libvirt)
>     (name "libvirt-with-qemu-bridge-helper")

This fixes only a variant of the libvirt library itself, it doesn't
cause your modified  version to be used. You may need to modify the
package definition of 'libvirt' instead.  Another method is to set the
'libvirt' field of 'libvirt-configuration' to your 'libvirt-with-qemu-
bridge-helper'.

Greetings,
Maxime.