why not use asdf or something like that?
Some of the scaffolding (Makefile, test macros, etc.) in the project is more than a decade old which I have copied from project to project over these years. Back then I was not aware of ASDF. Since this old scaffolding has been working fine for me, when I began rewriting MathB.in in Common Lisp, I just copied the same scaffolding over to this project. As a result, the thought of introducing ASDF for building and packaging never occurred to me. I might consider it though in future depending on my available leisure time and priorities.