[Cmake] upgrade to cmake >1.6.1

[vanessa.noguesruiz@epfl.ch]

Does anybody know where can I find a mirror where downloading a later version 
of cmake? It is that I am attempting to install vtk-4.2.2 and I get the 
following error: 

CMake error:
Command not found: "VTK_MAKE_INSTANTIATOR2" in CMakeLists.txt of 
Common,Filtering Graphics and Imaging


Thanks in advance