Tooling for C and C++ mostly relies on some external package manager, often the OS-provided one (on most Linuxes, for example). There isn't a standard cpan/npm/pip/cargo for C/C++, although there are plenty of tools that can do kind of the same thing.
There's also not much support for virtual environments (there are tools out there, but not ubiquitous tools). It's pretty easy to point the compiler to a different set of header files and libraries, even on a per-file basis, to get a similar effect.
And from the Apple side (which I have a vague understanding of, having dipped my toes in a few times): Most of the documentation assumes that you're using XCode, and I'm pretty sure that the version of the compiler is just tied to whichever version of XCode you're using (which has a somewhat looser tie to the version of MacOS you're running). So in that case, you'd be using the XCode-provided toolchain rather than the OS-provided one.
Not an official one for sure, Cargo is a blessing for people used to dealing with C/C++ dependency management.
You can fix that of course but homebrew does the same job on macOS.
Roll on 18.04LTS.
It does have the overhead of requiring you actually understand (or know how to google) your system/packages that you use though.
Wasn't that hard to do in the end but it's not something I've done for many, many years and doesn't fill me with confidence.
Other UNIX utilities are actually standard POSIX ones. If you are used to GNU extensions to these on Linux, then Mac ones may seem outdated, but ironically (macOS kernel is called XNU which stands for X is not UNIX) Mac is certified UNIX, while Linux is only UNIX like.