compilation error: ‘BAR_2’ was not declared in this scope
When compiling gmsh from master, one gets errors of the kind
/<<BUILDDIR>>/gmsh-3.0.2+git201705241639-43489e89/Geo/GModelIO_CGNS.cpp:158:4: error: ‘BAR_2’ was not declared in this scope
[...]
Full details here.