Default installation target does not work for existing databases

For a current setup I am working on, I am provided with an existing databases that will be used for the setup of caosdb.

I set up the options in .config, but during running make install I get:

A database with with the name '...' exists already.
Call 'make drop-...' to delete that database or change the database
name in your .config file 
./utils/make_db grant
Granting admin privileges to '...'@'localhost'
ERROR 1227 (42000) at line 1: Access denied; you need (at least one of) the CREATE USER privilege(s) for this operation
make: *** [Makefile:44: _grant] Error 1

Is there an automated way to set up the existing database for this use case?

DoD

• There is a configuration option in the mysqlbackend config, that allows an installation in an existing database.

Known problems

• SUPER privileges on the existing database are required to be able to create functions and procedures.