Hi Pau,
We've now tried the "osmo-gsm-tester" branch in your Git repository but struggled to get it to build. We followed the steps documented in the Ansible "gsm-tester" https://github.com/osmocom/osmo-ci/blob/master/ansible/roles/gsm-tester/task... role which clones the repository, switches branch and then begins config/compilation.
On a Debian 9 machine the error we're seeing consists of the line "make[1]: *** No rule to make target 'ell/util.c', needed by 'ell/util.lo'. Stop.". The same error also occurs on a Debian 10 system, and our intended Ubuntu 20.04 machine.
Are we missing a step that needs to be performed first?
Best, Callum.