Invenio-OAIServer is on PyPI so all you need is:
$ pip install invenio-oaiserverInvenio-OAIServer depends on Invenio-Search, Invenio-Records and Celery/Kombu.
Requirements
Invenio-OAIServer requires a message queue in addition to Elasticsearch (Invenio-Search) and a database (Invenio-Records). See Kombu documentation for list of supported message queues (e.g. RabbitMQ): http://kombu.readthedocs.io/en/latest/introduction.html#transport-comparison