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The foundation under everything that runs.
Every C program on your system links against a C library. It's the floor under userspace: malloc, printf, thread primitives, the syscall wrappers, all of it. Keru lets you choose which floor the rest of your system stands on.
The default, and the most compatible. Maximal feature set, broadest software support, the ecosystem baseline.
Small, fast, clean implementation. MIT-licensed, statically-friendly, famous for strict correctness and small binaries.
The maintained fork of uClibc — designed for embedded and minimal systems, tiny footprint, configurable.
Binary distributions can't really offer this — a prebuilt package set is glued to one libc. A source-only distribution can, because it compiles everything against whatever you picked. Keru carries that through: your chosen libc is bootstrapped first (in the toolchain stage), and every package is built against it.
musl and uclibc-ng are early-0.1 territory. The installer's stability check currently flags uclibc-ng combinations as not-yet-proven, and musl + systemd as a known-hard pairing. Warnings — never blocks. The stance.