os/build-system

Simple build system.

• Purely functional, with reproducible and bootstrappable builds in mind
• Runs commands in isolated environments (virtual machine or chroot or proot with env -i)
• Inputs are distinguished at the syntactic level, and dependencies are automatically computed
• Does not rely on filesystem timestamps
• Results are memoized (if an output happens to be the same after regeneration, it will not be seen as an updated dependency)