https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106851
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- I tried doing it this way instead namespace std { export using std::vector; namespace pmr { export using std::vector; } } but that didn't work, nothing got exported. But maybe that will be fixed by Nathaniel's https://gcc.gnu.org/pipermail/gcc-patches/2024-March/647088.html