https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99096
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:4e3590d06cf8a06fcc460ccda6150483a0311bae commit r11-7239-g4e3590d06cf8a06fcc460ccda6150483a0311bae Author: Jonathan Wakely <jwak...@redhat.com> Date: Sun Feb 14 20:38:32 2021 +0000 libstdc++: Restore <unistd.h> in testsuite_fs.h header [PR 99096] libstdc++-v3/ChangeLog: PR libstdc++/99096 * testsuite/util/testsuite_fs.h: Always include <unistd.h>.