There is quite simply a vast array of libraries out there that every developer has access to. As Ben points out at the 10:50 mark, looking at GitHub we can find

There is quite simply a vast array of libraries out there that every developer has access to. As Ben points out at the 10:50 mark, looking at GitHub we can find something on the order of 150,000 C projects. That's great, unless your employer/client/etc. is allergic to open source. I really can't consider something part of the language unless it's in a standard library that comes out of the box with the major compilers.