The Gbt Server is distributed via an rpm package which can be downloaded from the ECS YUM repository.

You can download the repository file here: lhcb-online.repo

Installation instructions:

#As root:
cd /etc/yum.repos.d
wget https://lhcb-online-soft.web.cern.ch/rpm/lhcb-online.repo

#you can then install Gbt Server from the repository:
yum update
yum install gbtserv

The Gbt Server source code can be found on the GIT repository:
https://gitlab.cern.ch/lhcb-readout40/software/gbtserv