It looks like build-package for cross-building does not fully work when using "build-on" and "run-on". When I specify: " on amd64 to armhf" in snapcraft.yaml snapcraft does not try to install the build package in question. Here is a slightly simplified example (full code in https://github.com/snapcore/pi-gadget): ``` name: pi version: 18-0.1 summary: something description: else type: gadget architectures: - build-on: amd64 run-on: armhf parts: uboot-pi2: plugin: nil override-build: | echo "do stuff" build-packages: - on amd64 to armhf: - gcc-arm-linux-gnueabihf ``` using this snapcraft.yaml does not trigger an install of gcc-arm-linux-gnueabihf. I need to trigger this via an explicit "snapcraft build --target-arch armhf" which I cannot do in launchpad (AFAIK).