'Return the repository\'s repository dependencies that are not currently installed, and may not ever have been installed.'

@property
def missing_repository_dependencies(self):

    missing_required_repositories = []
    for required_repository in self.repository_dependencies:
        if (required_repository.status not in [self.installation_status.INSTALLED]):
            missing_required_repositories.append(required_repository)
    return missing_required_repositories
