[CMake] CMake + NSIS on windows

[Andrea Crotti]

Now however CMake complains that it can't fin nmake, which from my
search it's something it's this:
http://superuser.com/questions/146577/where-do-i-find-nmake-for-windows-7

so cmake . generated by default the nmake files, but why cpack would
need nmake for in the first place if I'm just using NSIS?

Is this really a dependency which should be also installed?