Make has a dependency system. You can tell it how to create file A, and that it depends on file B, and tell it how to create file B. Then if you request file A,

Make has a dependency system. You can tell it how to create file A, and that it depends on file B, and tell it how to create file B. Then if you request file A, it will check whether file B exists, and create it first if it's missing or outdated. That's very valuable for building things. If you change a file, you only need to re-build the files that could reasonably be affected by the change. And things happen in the right order without micro-managing.