CMake is another barrier to entry.
what happened to a nice simple makefile? Been using just standard makefiles for literally 20 years.
The only thing I do is put a checkdeps dependency on which tests for the presence of dependencies, like autoconf but without the eye poking. Have built everything from small network servers to Motif behemoths doing only that.
CMake is more an alternative to GNU autoconf and pals, with the difference that it has first class support for things like MSVC and XCode.
I've quite happily built makefiles that work on Linux, FreeBSD, Solaris and HP/UX that aren't fragile or laborious. It just takes appropriate knowledge of the platforms. I've built some stuff on OSX (small SDL project) and it wasn't too obtuse apart from some paths.
CMake, much as all of these things, works up to a point at which point it tries desperately to kill you at every available opportunity.
(people rarely even attempt nontrivial Makefiles that are portable between BSD and GNU makes though...)