Could not compile file system watcher for Mac

To fix it in Catalina, set the correct headers path in .bash_profile:
export SDKROOT="$(xcrun --sdk macosx --show-sdk-path)"

(/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.15.pkg is not available in Catalina).

… and then recompile the deps.

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