Aiomqtt uses Poetry. The only difference between poetry and generic pep517 is the host-python-poetry-core dependency, and this got pulled in as an indirect dependency of host-python-poetry-dynamic-versioning so far. So the build was not actually failing, but it's better to be correct. Signed-off-by: Fiona Klute (WIWA) <fiona.klute@gmx.de> Signed-off-by: Arnout Vandecappelle <arnout@mind.be>