Don't use cmake for new projects. You'll regret it. Try meson instead:
More than that CMake at this point is the ""standard"" and there are many others with a similar share of the market and selling points, it makes it harder to pick one that is not CMake.
(Which is a whole other thing with this "modern CMake" by the way: only half of them that come with CMake are "upgraded" to modern and if you don't want to require the absolute latest version, you end up having to check what the FindX script did or redefine stuff manually)
I had a look at the Meson FAQ and it says:
> What is the correct way to use threads (such as pthreads)? > > thread_dep = dependency('threads') > > People coming from Autotools or CMake want to do this by looking for libpthread.so manually.
... which is false. We do:
> find_package(Threads REQUIRED) > target_link_library(my_app Threads::Threads)
and Bob's your uncle.
(It's been a while since I did semi-serious C++, maybe nowadays we're playing a bit more loose with deps and polyglot setups)