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Not so much an answer as a pointer to an idea - buildroot normally sets up only a subset of coreutils, and if you have a smallish subset, you might want to consider busybox with the relevant tools. – Danny StapleOct 10 '12 at 16:41
Thanks @Deer Hunter. How might a mortal have discovered this, or is it just common knowledge ? – DenisOct 12 '12 at 10:01
Trial and error - mostly reading the output from naive attempts to make chroot etc. and figuring out the dependencies. – Deer HunterOct 12 '12 at 10:03