google-glog is available on ubuntu/debian system. it is used by libraries like ceres (optimisation solver) which is itself used by OpenTURNS. So if we enable OpenTURNS in Feel++ then we get duplicate symbols for google-glog (eg logtostderr defined twice in glog from ceres and in glog from feelpp.
However the Feel++ version takes care of logging for mpi applications and it doesn't seem to be easy to add the support externally at first glance.
For now I suggest that OpenTURNS support is disabled

/cc @vincentchabannes @thomas-saigre