Hi Markus
You're right, for the moment, the compilation/installation of Mascaret is a little bit complex.
There is also a particularity. The sources are only available for mascaret computational core and in the automatic installer, there is also the interface Fudaa-Mascaret which is include...
The consortium is currently working on the integration of mascaret sources on the SVN trunk so it will be easier soon.
Nevertheless, in the sources zip, you should have a makefile which allow you to compile mascaret.
Be aware that for the moment, there is no sediment part available in mascaret!
With the integration on the SVN, the module COURLIS for suspended sediment computation will be also available.
Hope this helps you and clarify things
Regards