Well I mean, it tells you what you need to gather if you do this, too:

Then, enter in your password to allow your PC to go into it's root.

Now, change the pointed directory to where Graal is located.

Finally, go ahead and execute your Graal client.

That's it, now you're finished. It should say something like, "Error: Dependency xxxx does not exist!"

Remember: Do not boot Graal like this after the dependencies have been installed, as it will lock the ~/.graal/graal4 directory to the root user, allowing no changes/executions from regular users. (it chmods it to 755 for root, thus not allowing anyone else to do anything.)

Edit:
I wish Stefan would just pack it into a simple deb so you could do sudo dpkg -i Graal.deb and it would just state what you need to install from Synaptic and this could all be done with.