From Pere:

Adds CPack installer capabilities to the CMake system.
To generate the installers is as simple as making the target 'package' . Alternatively you can use the cpack command like this:
  cpack -G NSIS
or 
  cpack -G PackageMaker


git-svn-id: http://root.cern.ch/svn/root/trunk@40270 27541ba8-7e3a-0410-8455-c3a389f83636