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[Solved] Homebrew Command Not Found & PATH Collision on Apple Silicon on MacBook Pro 14″ M4: How to resolve Shell startup files invoking obsolete Intel /usr/local/bin before native /opt/homebrew/bin

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Home › Forums › Apple Silicon, Terminal & Developer Tools › [Solved] Homebrew Command Not Found & PATH Collision on Apple Silicon on MacBook Pro 14″ M4: How to resolve Shell startup files invoking obsolete Intel /usr/local/bin before native /opt/homebrew/bin

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  • November 15, 2026 at 4:59 am #20005
    Stephanie Scholz
    Community Contributor
    Diagnostic Hardware Specs: MacBook Pro 14″ M4 (24GB) | OS Version: macOS Sequoia 15.1 | Archive Source: Apple Support Community #256472244

    I am running into a persistent issue on my MacBook Pro 14″ M4 (24GB) running macOS Sequoia 15.1.
    Whenever the machine encounters Shell startup files invoking obsolete Intel /usr/local/bin before native /opt/homebrew/bin, the following diagnostic log appears in Console:

    zsh: command not found: brew (architecture mismatch: invoking x86_64 homebrew under arm64 zsh session)

    I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

    Mac Studio M2 Max (64GB) | Neumann KM184 Pair | Logic Pro 11 | Sydney, AU
    Classical Pianist & Spatial Audio Arranger | "Verified Apple Discussions Archive"
    November 15, 2026 at 4:59 am #20006
    Jonathan Smith
    Community Contributor
    Apple Recommended / Verified Community Solution
    This canonical solution was verified and marked as solved in the Apple Support Community archive.

    Injecting official Apple Silicon Homebrew environment evaluation into ~/.zprofile.

    Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

    1. Add native ARM64 prefix to profile: 
      echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> ~/.zprofile
eval "$(/opt/homebrew/bin/brew shellenv)"
    2. Verify native execution: 
      which brew
file $(which brew) # must output: Mach-O 64-bit executable arm64
    3. Run diagnosis: 
      brew doctor

    Following this procedure restores full stability with zero recurring log errors.

    iMac 24″ M3 (16GB) | Kawai MP11SE Stage Piano | AirPods Max | Kyoto, JP
    Apple Certified Support Professional (ACSP) | Classical Pianist & Spatial Audio Arranger
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