Confirming Justin on an older OS X:
$ uname -a
Darwin GC06259 15.6.0 Darwin Kernel Version 15.6.0: Mon Nov 13 21:58:35 PST
2017; root:xnu-3248.72.11~1/RELEASE_X86_64 x86_64
$ gcc forksigaltstack.c -o forksigaltstack && ./forksigaltstack
status = 4
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