message: Delete missed constexpr
diff: @@ -57,7 +57,7 @@ namespace RINGMesh {
  class RINGMESH_API GeoModelBuilderGM final : public GeoModelBuilderFile {
  public:
  - static constexpr index_t NB_VERSION = 2 ;
  + static const index_t NB_VERSION = 2 ;
  GeoModelBuilderGM( GeoModel& geomodel, const std::string& filename ) ;
  virtual ~GeoModelBuilderGM() ;
  