I went to the site and downloaded the script.
I saw it makes me install billions of packages, including developpment packages. Then it just "make install".
I thought I didn't want a "dirty" install like this, so I begun setting up a virtual machine to install all that stuff and make a deb package with checkinstall.
I left my computer alone during the reboot of the virtual machine after installing the guest additions, and when I came back, my screensaver was working
I did absolutely nothing, but now it works. Pretty strange, but I don't really care as long as it works...
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