void CityXMLManager::print_patch_to_xml (
     patch_type _type,
     vector <patch_type> & _neighbours_types,
     vector <pair<Vector3, float > > & _obstacles)

Use of undeclared identifier 'patch_type'
Variable has incomplete type 'void'
'_neighbours_types' was not declared in this scope
'_patch_types' was not declared in this scope
Reference to 'vector' is ambiguous