[vtkusers] Problem compiling InsightApplications agains VTK 5.1 (cvs)

[Kent Williams]

This one is a stumper for me.  When I compile 
InsightApplications/ThresholdSegmentationLevelSet, 
ShapeDetectionLevelSet, or DeformableRegistration3DTimeseries, I get 
this link error:

.../lib/libvtkRendering.a(vtkCellCenterDepthSort.o)(.text+0x3d9): In 
function `vtkCellCenterDepthSort::GetNextCells()':
.../VTK/Rendering/vtkCellCenterDepthSort.cxx:249: undefined reference to 
`vtkSortDataArray::Sort(vtkDataArray*, vtkDataArray*)'

I thought just changing the link order -- what this message tells me is 
that vtkRendering depends on vtkGraphics (where vtkSortDataArray lives), 
but that doesn't do it.
Then I looked at the CMakeLists.txt file in VTK/Rendering, with the 
intention of making Rendering depend on Graphics, but VTK seems to have 
it's own dialect of CMake that means there's no obvious place to force 
the dependency.

This is with Insight CVS, InsightApplications CVS, VTK 5.1 (CVS).  
System: RHEL Linux, gcc 4.1.0 ...