The build should work out of the box without the need to install anything, check the README.me at the root of the project to have a look at the options you can use to run the build. It might not run some tests, but it shouldn't throw errors.

For some datastores you might set environment variables but only if you want to run the test on an external db.

Jenkins doesn't do anything special, it executes the maven commands, you can see it in the log: http://ci.hibernate.org/view/OGM/job/hibernate-ogm-master/471/consoleFull

I don't know what you mean when you say:"Can I move ALL the tests that way?", which tests are you talking about?

When you have an error, you need to show in the comments the error message, otherwise I cannot help you.
It is also possible that you have found a new bug, so you should also add which operating system you are using and how you
run the build, from the IDE? Which one? From the terminal? When does it fail?