Thanks! Looks like I was on a good track. The only reference that I could
find to /usr/libexec/qemu-bridge-helper was in the meson.build file of the
libvirt package. I wrote a package variant that looks like this, to test:
(define-public libvirt-with-qemu-bridge-helper
(package
(inherit libvirt)
(name "libvirt-with-qemu-bridge-helper")
(arguments
(substitute-keyword-arguments (package-arguments libvirt)
((#:phases phases)
#~(modify-phases #$phases
;; libvirt needs to be able to find qemu's bridge helper
;; this is hacky, perhaps a patch on meson.build would be
better.
(add-after 'unpack 'find-qemu-bridge-helper
(lambda* (#:key inputs #:allow-other-keys)
(let* ((qemu (assoc-ref inputs "qemu")))
(substitute* "meson.build"
(("/usr/libexec/qemu-bridge-helper")
(format #f "~a/libexec/qemu-bridge-helper"
qemu))))))))))
(inputs
(modify-inputs (package-inputs libvirt)
(append qemu)))))
However the effort was fruitless, and my efforts on this are currently on
pause. If I am able to fix it I plan to submit a patch.
