I'm using vtk with cocoa on 10.7 mac os and it works fine. OSX architecture x86_64 -- View this message in context: http://vtk.1045678.n5.nabble.com/Changing-Defining-VTK-s-minimum-Mac-OS-X-requirements-tp5506813p5564473.html Sent from the VTK - Dev mailing list archive at Nabble.com.