: 1
name: baz
version: 1.0.0
summary: baz
license: MIT
url: http://example.org
email: pkg@example.org
depends:\
liba
{
  prefer
  {
    # Prefer `gui` but can work with `gui` or `cli`.
    #
    config.liba.backend = ($config.origin(config.liba.backend) == 'default' || \
                           ($config.liba.backend != 'gui' && $config.liba.backend != 'cli') \
                           ? 'gui' \
                           : $config.liba.backend)
  }

  accept ($config.liba.backend == 'gui' || $config.liba.backend == 'cli')
}
\
