SEAFILE_VERSION = '5.1.0' in seahub-6.0.4-server.tar.gz

I managed to build Seafile server from source on my Pine64 running jessie according to https://manual.seafile.com/build_seafile/server.html
I had to add sudo pip install django-picklefield and sudo on make install.
BUT
About say Server Version 5.1.0 and this might come from seahub/settings.py
SEAFILE_VERSION = ‘5.1.0’?