Support Homebrew env for macOS build about stitchem HOT 7 CLOSED

Oh I think I can do that, I'll at least have a look

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Biggest difference: the APPLE_MACPORTS option in CMake currently adds lookup in /opt/local, whereas homebrew puts the files in /usr/local, IIRC.

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Ah... I misread the description, trickier than I thought. I still can have a look though

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Shouldn't we just drop external deps for linux and mac ?

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or may be use a CPP package manager like conan. But I'm not sure every lib we use has a receipe

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Shouldn't we just drop external deps for linux and mac ?

Yes. The APPLE_MACPORTS option was just a crutch to migrate away from external deps, when I wasn't sure whether it would work immediately everywhere.

For macOS and Linux we should use the official CMake find modules, wherever possible. If there's no module, there should be the possibility of adding /opt/local and /usr/local globally to the CMake search paths, so the paths don't have to be repeated in every find incarnation.

In the end CMake should find everything on its own without setting APPLE_MACPORTS or LINUX_PKG, but the user should still have the opportunity to override the package location with a manual option. I'm not sure what the current CMake best practices say how to do this, need to look at other projects.

As long as we don't have anything else on Windows, I'd like to keep the external_deps system working there.

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or may be use a CPP package manager like conan. But I'm not sure every lib we use has a receipe

For macOS and Linux I'd try to keep using the packages from the system package manager for simplicity reasons, wherever it makes sense.

To get a Windows build working conan is definitely an option. When I looked at that earlier I was disappointed to not find ffmpeg in the conan center (ffmpeg being one of the huge pain points on Windows), but there seem to be some 3rd party conan ffmpeg packages on GitHub, maybe they'll work.

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