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If you're speaking about:

If you're speaking about:
#elif (defined(__APPLE__) || defined(__MACOSX__)) && defined(_REENTRANT)
/* Latest XCode works with OpenMP, need to recheck here */

This is not bug, but specially added because standard Apple toolchain does not support OpenMP

For other toolchains one may use -DLIBRAW_FORCE_OPENMP to enable this #if-branch:

-- Alex Tutubalin @LibRaw LLC