https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117210
--- Comment #12 from Dimitry Andric <dimitry at andric dot com> --- So, something like this? diff --git a/libstdc++-v3/config/os/bsd/freebsd/os_defines.h b/libstdc++-v3/config/os/bsd/freebsd/os_defines.h index 0d63ae6cec4..e414524dcc2 100644 --- a/libstdc++-v3/config/os/bsd/freebsd/os_defines.h +++ b/libstdc++-v3/config/os/bsd/freebsd/os_defines.h @@ -26,6 +26,9 @@ #ifndef _GLIBCXX_OS_DEFINES #define _GLIBCXX_OS_DEFINES 1 +// For __ISO_C_VISIBLE and __LONG_LONG_SUPPORTED +#include <sys/cdefs.h> + // System-specific #define, typedefs, corrections, etc, go here. This // file will come before all others. I think a similar approach might be needed for NetBSD and/or OpenBSD, btw.
