[vtkusers] Migration to VTK6

[Ben Boeckel]

On Fri, Dec 11, 2015 at 10:36:18 -0500, Sean McBride wrote:
> Why?  CMake, only recently perhaps, accepts strings like "macosx10.11"
> as David wrote.  Which is really nice, because hardcoding paths is
> fragile of course.

Hmm, that is new behavior to me. The paraview superbuild needs to
smarten up then (it uses the value in --sysroot= flags it passes to
subprojects).

--Ben