You guess it - I tried to convince cingg to build on macos 10.12.6 bchash.C:184:13: error: use of undeclared identifier 'open_memstream' seems to exist (reimplemented ) here https://android.googlesource.com/platform/system/core/+/cf63d5d00f5a631a2905... fmemopen also used in bchash.C https://github.com/mprzybylski/darwin-fmemopen pthread_spinlock_t does not exist here ... https://stackoverflow.com/questions/8177031/does-mac-os-x-have-pthread-spinl... there is also bunch of dirent64 vs dirent and this ffmpeg.C:4499:26: error: no member named 'st_mtim' in 'stat' time_t t = (time_t)tst.st_mtim.tv_sec; ~~~ ^ ffmpeg.C:4502:20: error: no member named 'st_mtim' in 'stat' int64_t us = tst.st_mtim.tv_nsec / 1000; ~~~ ^ 20 warnings and 19 errors generated. ==== I set build against wrong ffmpeg includes ....