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[Solved] Homebrew Command Not Found & PATH Collision on Apple Silicon on macOS Sequoia 15.1: Diagnostic steps and permanent fix

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Home › Forums › Apple Silicon, Terminal & Developer Tools › [Solved] Homebrew Command Not Found & PATH Collision on Apple Silicon on macOS Sequoia 15.1: Diagnostic steps and permanent fix

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  • November 15, 2026 at 12:44 am #15832
    Raymond Gonzales
    Lead Moderator
    Diagnostic Hardware Specs: Mac mini M4 (16GB) | OS Version: macOS Sequoia 15.1 | Archive Source: Apple Support Community #256887104

    I am running into a persistent issue on my Mac mini M4 (16GB) 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?

    MacBook Pro 14″ M1 Pro (16GB) | Apple Diagnostics Suite | Wi-Fi 6E Sniffer | Madrid, ES
    Apple Certified Service Technician (ACiT / ACSP) | "Verified Apple Discussions Archive"
    November 15, 2026 at 12:44 am #15833
    Jeffrey Koehler
    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.

    iPad Pro 13″ M4 (Magic Keyboard + Cellular) | iPhone 15 Pro | Boulder, CO
    Apple Certified Support Professional (ACSP) | Digital Nomad & Travel Filmmaker
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