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ISO C99 requires <errno.h>. Many files in the project already include <errno.h> unconditionally, so it's reasonable to assume that it is always available. Link: <https://github.com/shadow-maint/shadow/pull/600> Cc: Christian Göttsche <cgzones@googlemail.com> Cc: Iker Pedrosa <ipedrosa@redhat.com> Cc: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Alejandro Colomar <alx@kernel.org>