Migration for auth_user.username field

I am responsible for the SQL Anywhere Django driver and I'm trying to add support for Django 1.10. When I create a project and run "python manage.py migrate", it executes a bunch of SQL statements but then fails when altering the auth_user table to

migrate gives SQL error on my DB backend

I'm not familiar enough with the migration stuff to know what it is I'm missing. Can anyone help? Thanks Graeme Perrow -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails