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由 viro@ZenIV.linux.org.uk 提交于
envctrl doesn't need unistd.h; moreover, since it declares errno static gcc4 gets very unhappy about including unistd.h. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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