List of (not all Linux) distributions that can be bootstrapped from source:

https://github.com/vasi/bootstrappable-distros

The best way to learn linux !

LFS is great. Unfortunately nowadays I often fail to compile it; most recently with GCC complaining and failing at options.cc. But I also get more issues here.

I kind of need a LFS variant that is more flexible. For instance, the part up to having a working standalone compiler, should ideally become more robust and/or decoupled from the actual LFS build process. Once I have a sane toolchain, the rest is trivial, ruby scripts solve that part for me. But the build up towards that is not so reliable. Things also fluctuate so much in the build process; I still need perl for instance, and python wants to add more and more complexity into the build system as well, even though meson/ninja is a nice combo. For some reason, the build situation on Linux is not very elegant to word this nicely. Then we also "now you need LLVM and glslang and spirv" and so forth, and so on. The complexity always increases. To some extent I can understand why slackware crumbled. How can a single person, even with scripts, keep that all working?

Related. Others?

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The fastest way to learn and remember what Linux is about

I did LFS once, a long long time ago (days of RedHat 7.3, I'd say, 2002), and it was quite educational! It's a good way to learn the fundamentals of what comprises an actual Linux system

Very cool; good Job!

This whole project wastes time that could be spent learning operating system design and it spends it telling users to download files, extract them, and run ./configure; make; make install 100 times.

LFS is really, really bad. Also, reading the Linux kernel documentation to understand how to do it right is infuriating because it too is really, really bad.