basename/dirname in libc6

[Michael Meskes <meskes@debian.org>]

I only get the dirname prototype if I include libgen.h but this also defines
basename to xpg_basename which gives ouutput that is incorrect IMO:

xpg_basename("./foo")="/foo" instead of "foo".

Removing libgen.h and defining _GNU_SOURCE to get the basename prototype
from string.h leaves me without a dirname prototype. So what is the correct
way to use these functions?

Michael
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