Try 'snapcraft update' first, then try rebuilding. Otherwise, it looks like you are missing 'gcc-multilib' in your build-packages somewhere. That should get pulled in by plainbox-provider-snappy though, so I think running snapcraft update should work.
Try 'snapcraft update' first, then try rebuilding. Otherwise, it looks like you are missing 'gcc-multilib' in your build-packages somewhere. That should get pulled in by plainbox- provider- snappy though, so I think running snapcraft update should work.