ERROR: No ConfigurableUser specialization found

I am not able to build Gaudi on lxplus following our official instructions:

[lxplus731] ~/tmp/Gaudi/build > make
[...]
WARNING: Specified module 'Gaudi.ConfUser' does not contain ConfigurableUser specializations
ERROR: No ConfigurableUser specialization found
make[2]: *** [Gaudi/genConfDir/Gaudi/Gaudi_user.confdb] Error 1
make[2]: Target `Gaudi/CMakeFiles/Gaudi_confuserdb.dir/build' not remade because of errors.
make[1]: *** [Gaudi/CMakeFiles/Gaudi_confuserdb.dir/all] Error 2

Seems to be related to !1269 (merged).

What am I missing and why is it working in the CI?

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