b2542bf9ab6cce97fcb67ff9536e1062c70b5b11
Simply avoid the trouble and use a void* if the define is missing. We lose type safety, but who cares. sigaction(2) says that siginfo_t requires _POSIX_C_SOURCE >= 199309L, but we can be a bit more generous and use the same define as /usr/include/signal.h.
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