https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80196
--- 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 now I > had added: > > export > CPLUS_INCLUDE_PATH=/opt/local/include/c++/12.0.1:/opt/local/include/c++/12.0. > 1/x86_64-linux-gnu/ > > to my .bashrc Don't do that. This causes GCC 12.1 to find the headers for GCC 12.0.1 instead of the libc headers. That breaks the build, but is user error.
