__STDC_VERSION__  300 opal/mca/event/libevent2022/libevent/util-internal.h #if defined(__STDC__) && defined(__STDC_VERSION__)
__STDC_VERSION__  301 opal/mca/event/libevent2022/libevent/util-internal.h #if (__STDC_VERSION__ >= 199901L)
__STDC_VERSION__  549 opal/mca/pmix/pmix4x/pmix/src/include/pmix_config_bottom.h # if __STDC_VERSION__ >= 199901L