[vtkusers] why arise problem like "Unresolved external ..." when i use vtk in c++ builder?

[wuhao1126 Howell]

when i use vtk in borland c++ builder, there alway is a error as follow:
[Linker Error] Unresolved external 'vtkSphereSource::New()' referenced from 
E:\PROGRAM FILES\BORLAND\CBUILDER6\PROJECTS\VTK_TEST\UNIT1.OBJ

how can i solve this problem?



best wishes
         
Howell