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BSD libc and BSD make are pretty much drop in replacements for glibc and GNU make. LLVM is a drop-in replacement for gcc.

It seems like it would be pretty straightforward to build a Linux userland without GNU.

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I don't think bsd libc supports linux specifics such as fanotify and such, the libc is usually tied to a kernel. (I haven't looked at bsd libc so I may be wrong)

My point isn't that there aren't competent replacements. Obviously the BSDs in general have different userlands, as does Solaris, and so forth. But those things -are- the userland on a Linux system.

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