[pedrocr]

Those look like exactly the kinds of dependencies I'd go for if I needed to write a new C build system. Nothing ridiculous about them.

[quietbritishjim]

The emacs dependency is odd to say the least, but I'm pretty sure CMake doesn't actually depend on it. I don't know much about Gentoo but perhaps the question mark after it means it's just a suggested dependency.

[rleigh]

It will be the cmake-mode for editing CMakeLists.txt files.

[nwmcsween]

Anything dep a ? is optional