https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103758
--- Comment #14 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Oops, that broke the build: .../c-family/c-format.c:3229:22: error: ‘startswith’ was not declared in this scope 3229 | && startswith (format_chars, "decl-specifier")) I've reverted the patch.