Add missing include

dune/vtk/types.hh

@@ -7,6 +7,7 @@
 
 #include <dune/common/ftraits.hh>
 #include <dune/common/typelist.hh>
+#include <dune/common/version.hh>
 #include <dune/geometry/type.hh>
 #include <dune/grid/io/file/vtk/common.hh>
 #include <dune/vtk/utility/arguments.hh>
@@ -57,8 +58,10 @@ namespace Dune
     };
     std::string to_string (Vtk::DataTypes);
 
+#if DUNE_VERSION_GTE(DUNE_GRID,2,7)
     // Map a dune-grid Precision type to DataTypes
     Vtk::DataTypes dataTypeOf (Dune::VTK::Precision);
+#endif
 
     // Map a string to DataTypes
     Vtk::DataTypes dataTypeOf (std::string);