[CMake] CMake Error: An attempt was made to access a variable: CMAKE_SIZEOF_INT that has not been defined

[Michael Jackson]

Why exactly might I get this error? There is someone on the vtk users  
list that is getting this error when trying to compile VTK 5.0.1 on OS  
X intel 10.5.6 with Xcode 3.1.

Thanks
_________________________________________________________
Mike Jackson                  mike.jackson at bluequartz.net
BlueQuartz Software                    www.bluequartz.net
Principal Software Engineer                  Dayton, Ohio