Which would go away if C++ had a working package manager, that worked in the same way every other language did, was written once only and about as bug free as the compiler. This would also allow you to ship the source code for the library with a simple file that list the dependencies you need.
I guess my final issue boils down to this: CMake does too much and too little. It is too hard to get it reliably pull down the libraries I want to use and it can do too much as part of the build to the point that it becomes too complicated.
Do one thing, and do it well.
