Compilation script does not work!

The official or semi-official script to download and compile Cairo dock (http://glx-dock.org/ww_page.php?p=By%20compiling&lang=en) does not work. If one tries to use the script's 'install from git' option, it gives this error:

----------------------------------------------------

fatal: repository 'Cairo-Dock/cairo-dock-core' does not exist
It seems that there is some problems. Please check your Internet connexion or retry later!

----------------------------------------------------

Moreover, when one tries to use the script's PPA option, one gets (or I got, anyway):

----------------------------------------------------

W: The repository 'http://ppa.launchpad.net/cairo-dock-team/weekly-debian/ubuntu jaunty Release' does not have a Release file.
E: Failed to fetch http://ppa.launchpad.net/cairo-dock-team/weekly-debian/ubuntu/dists/jaunty/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Installation des paquets Cairo-Dock, version instable

----------------------------------------------------

Linux Mint 18 Cinnamon