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Inspired by https://www.openwall.com/lists/musl/2020/10/28/11 Define sigev_notify_thread_id only when needed, quoting https://sourceware.org/bugzilla/show_bug.cgi?id=27417 Both freebsd and musl actually have this macro defined under <signal.h> Fixes build error: ../lib/igt_aux.c:191:20: error: ‘struct sigevent’ has no member named ‘_sigev_un’ 191 | sev.sigev_notify_thread_id = __igt_sigiter.tid; ../lib/igt_aux.c:1994:12: error: ‘struct sigevent’ has no member named ‘_sigev_un’ 1994 | sev.sigev_notify_thread_id = gettid(); Link: #138 Signed-off-by: Bernd Kuhls <bernd@kuhls.net> Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
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