Starting in Mojave, the Command Line Tools no longer installed headers needed for compiling C code. The most noticeable problem is when installing applications from source in Homebrew, and a report of no zlib found.

Have you ever thought of how you got to where you are in life and specifically in your career? How many of us are in an occupation that is not what we set out to be in when starting our career or starting college? I am willing to bet the number is significant.