As #Apple's #OpenCL implementation got deprecated and —I'm told— started degenerating towards uselessness, more people have started installing alternative ones through #Homebrew —typically PortableCL #PoCL.
This in turn returns an OpenCL library that is a #ICD loader —so people also install ocl-icd (again from Homebrew).

This poses an interesting conundrum for me as the #clinfo maintainer.