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  1. After much debugging with LLDB, sem_init() in sc_host_semaphore.h fails with errno 78 (function deprecated) since Macosx has recently dropped support for unnamed semaphores. this failure causes a recursive loop to sc_simcontext::init() which results in a segfault. Switching the use of POSIX semaphores to Apple's Dispatch Semaphore seem to work. details on replacing sem_init() are here: https://stackoverflow.com/questions/1413785/sem-init-on-os-x/1452182
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