[viraptor]

It will be ok in most cases... until it won't. What this script does is install dependencies. And fails for anything that isn't the most popular system. I really don't see the point of writing a script like this, as opposed to the following text:

    Requirements: git, prolog (package swi-prolog-nox, or swi-prolog).
    To install checkout repository https://github.com/larsyencken/marelle and run "make install" (optionally with DESTDIR=/your/custom/destination/path).

Less writing, clear instructions and provided you know how to write a standard well-behaved makefile, it will also not assume surprising things about your system. Also they could ship the bin file without a static path in their repo instead of creating it on installation for some reason.

Those bootstrap files are really annoying me - also because they assume zero knowledge from the user (even if that user is supposed to later write system standup script in prolog... oh the irony). It also gets completely redundant sometimes - like the composer in php (https://getcomposer.org/installer) - it's a php script that includes loads of logic to download a single file and put it in the correct directory. And it's not an unusual case.

I really believe the bootstrap scripts are both useless and harmful, apart from a very few special cases.