Building GCC From Scratch Natively on OSX 10.11 (El Capitan) and Above

With every iteration of their desktop operating system, Apple seems more and more determined to try new and novel ways to irritate me. The rootless security model that prevents anyone from writing to ‘/usr‘ (except for ‘/usr/local’; though there is no way for you to re-create this directory if you wipe it). The big problem is that the build process of GCC requires that ‘/usr/include’ exists, and the OSX 10.11 security model does not allow you to create it. Booooooooo, Apple.