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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/80196] fenv_t not declared
Date: Fri, 06 May 2022 20:44:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D80196

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Eddy L O Jansson from comment #15)
> For reasons that I'll skip, between the successful build of 12.0.1 and no=
w I
> had added:
>=20
> export
> CPLUS_INCLUDE_PATH=3D/opt/local/include/c++/12.0.1:/opt/local/include/c++=
/12.0.
> 1/x86_64-linux-gnu/
>=20
> to my .bashrc

Don't do that. This causes GCC 12.1 to find the headers for GCC 12.0.1 inst=
ead
of the libc headers. That breaks the build, but is user error.=