If you are using Linux and you try run this project, Gaia version 6 WUs will error out and the error will be:

error while loading shared libraries: libquadmath.so.0: cannot open shared object file: No such file or directory

You have to manually install the libquadmath library, for Ubuntu and similar just run:

sudo apt install --reinstall libquadmath0

(or whatever command you use to install on other Linux distributions)
And then they will happily complete.
Maybe one day the WUs will be fixed and include the library by themselves instead of looking for it on your system, but until then, do that.