We use here the command-line, non-interactive CMake interface.
#. `Download <http://www.cmake.org/cmake/resources/software.html>`_ and install
- CMake. Version 2.8.8 is the minimum required.
+ CMake. Version 2.8.8 is the minimum required, but if you're using the Ninja
+ backend, CMake v3.2 or newer is required to `get interactive output
+ <http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20141117/244797.html>`_
+ when running :doc:`Lit <CommandGuide/lit>`.
#. Open a shell. Your development tools must be reachable from this shell
through the PATH environment variable.