This is the main difference between trying to get some ancient code written in C working vs "modern" toolchains - if you have the compiler and the code for C, everything is self-contained; many things like python2 download absolutely tons of support code and libraries to "build" - and when those go offline you can't easily build anymore; and you can't even say "this here VM will build this forever" unless you make sure that it will continue to work (and everything is separately cached/downloaded).