The initial error i got was: `Failed to copy 'libevent-2.1.so.7': no such file or directory.` This error occurs because the lib on the host system doesn't match the version on the snap's multipass instance. `shards install` doesn't update the lib/ and bin/ folder on the multipass instance, which leads to a stale build. My current workaround is to delete the two folders on "pull" to ensure that the shards are built on the multipass instance: ``` override-pull: | snapcraftctl pull rm -rf $SNAPCRAFT_PART_SRC/lib $SNAPCRAFT_PART_SRC/bin ``` I'm not sure if this issue is specific to Crystal, or if the behaviour is fundamentally problematic, and built files from the host shouldn't be copied over at all. Potentially `.gitignore` could be considered. If the issue is specific to Crystal we could add the delete command or something similar to https://github.com/snapcore/snapcraft/blob/master/snapcraft/plugins/v1/crystal.py#L92.