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Apple 20 errors

macOS & Xcode Errors

Command line tools, dyld, Homebrew permissions, notarisation and Keychain.

Understanding Apple errors

macOS developer errors concentrate around three subsystems: the command line tools (xcrun and the active developer directory), the dynamic linker (dyld, library paths, and code signing), and Gatekeeper / notarisation. Apple Silicon added a fourth axis: architecture mismatches between arm64 and x86_64 binaries, which usually surface as confusing "library not loaded" or "bad CPU type" messages rather than as an explicit architecture error.

How to debug Apple errors

  1. Check the active developer directory first with xcode-select -p. After every macOS or Xcode update this can point at a path that no longer exists, breaking git, compilers and package managers all at once.
  2. For dyld errors, run otool -L /path/to/binary to list what it actually wants, then verify each path exists. DYLD_PRINT_LIBRARIES=1 shows the resolution order at runtime.
  3. Confirm architecture with file /path/to/binary and uname -m. On Apple Silicon, a Rosetta shell reports x86_64 and will silently install the wrong Homebrew prefix.
  4. Homebrew lives at /opt/homebrew on Apple Silicon and /usr/local on Intel. Permission errors under /usr/local on an M-series Mac almost always mean a Rosetta/native mix-up.
  5. For Gatekeeper and notarisation, use spctl -a -vvv to assess a bundle and xcrun notarytool log to get the actual rejection reason. The submission status alone tells you nothing useful.

Tools worth reaching for

  • xcode-select -p
  • otool -L
  • codesign -dv --verbose=4
  • spctl -a -vvv
  • xcrun notarytool log

All 20 Apple errors

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