src/algorithms/fardetectors/FarDetectorTrackerCluster.cc:113:26: error: use of undeclared identifier 'ulong'; did you mean 'long'?
ROOT::VecOps::RVec<ulong> clusterList = {maxIndex};
^~~~~
long
No, actually this is from a private build on macOS. IIRC the GNU libc headers allow ulong and such by default, and sys/types gets included somewhere along the way.
ulong from sys/types is not a standard C type
This fixes a compilation error: