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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/99995] [11/12 Regression] should not include
 <unistd.h> in c++20 mode
Date: Wed, 21 Apr 2021 12:06:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99995

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Similarly, <semaphore> unconditionally includes POSIX <semaphore.h> even if
we're not going to use it.=