You may want to take a look at this: <http://www.vtk.org/Testing/Sites/RogueResearch4/Mac10.5-VTKBS-rel/ 20071217-0300-Nightly/Notes.html> It is a universal 64 bits build under 10.5 using cocoa. Mathieu >Hi, >I need 64-bit VTK for cocoa on Mac 10.5! can any one build success, may >tell me how to configure and build. >Thanks > > wells