name: "Setup GNU tools (macOS)"
description: |
  Installs GNU versions of bash, getopt, and make on macOS runners.
  Required because lib.sh needs bash 4+, GNU getopt, and make 4+.
  This is a no-op on non-macOS runners.
runs:
  using: "composite"
  steps:
    - name: Setup GNU tools (macOS)
      if: runner.os == 'macOS'
      shell: bash
      run: |
        brew install bash gnu-getopt make
        {
          echo "$(brew --prefix bash)/bin"
          echo "$(brew --prefix gnu-getopt)/bin"
          echo "$(brew --prefix make)/libexec/gnubin"
        } >> "$GITHUB_PATH"