[vtkusers] Problem compiling vtk 5.6.1

[John Drescher]

> Seems like I will have to add
>
> TCL_INCLUDE_PATH and TCL_LIBRARY  by hand. Cmake will not show these options
> automatically
>

CMake does not normally find libraries and includes on the windows
platform (well at least for me) because there is not a standard
location for these. Normally I either set these in the environment if
the finder accepts that or set them via CMake-gui.

John