Hi dimproject,
To be honest, using CMake on windows is not the preferred way of compiling Valyria.
You might want to use C::B and the dependencies archive I provided as a link in the README.
That said, if you're actually willing to test CMake on Windows, you'll need the Gettext windows SDK, requested by the FindGettext.cmake script.
You should also have a look at where the script below is searching the files, and what files are actually being searched:
C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/FindGettext.cmake
Good luck on this one