brew/package/Distribution.xml

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<installer-gui-script minSpecVersion="2">
  <pkg-ref id="sh.brew.homebrew"/>
  <options customize="never" hostArchitectures="x86_64,arm64" rootVolumeOnly="true"/>
  <volume-check>
    <allowed-os-versions>
        <os-version min="11.0.0"/>
    </allowed-os-versions>
  </volume-check>
  <choices-outline>
    <line choice="default">
      <line choice="sh.brew.homebrew"/>
    </line>
  </choices-outline>
  <choice id="default"/>
  <choice id="sh.brew.homebrew" visible="false">
    <pkg-ref id="sh.brew.homebrew"/>
  </choice>
  <pkg-ref id="sh.brew.homebrew" onConclusion="none">Homebrew.pkg</pkg-ref>

  <title>Homebrew</title>
  <organization>sh.brew</organization>

  <background file="Homebrew.png" alignment="bottomleft" scaling="proportional"/>
  <background-darkAqua file="Homebrew.png" alignment="bottomleft" scaling="proportional"/>
  <welcome file="WELCOME.rtf"/>
  <license file="LICENSE.rtf"/>
  <conclusion file="CONCLUSION.rtf" />
  <allowed-os-versions>
    <os-version min="11.0"/>
  </allowed-os-versions>

  <script>
    // See https://developer.apple.com/documentation/installer_js
    function installation_check() {
      if (system.files.fileExistsAtPath("/Library/Developer/CommandLineTools/usr/bin/git")) {
        return true;
      } else {
        my.result.title = "Command Line Tools (CLT) are missing";
        my.result.message = "You must install the Command Line Tools (CLT) before installing Homebrew by running `xcode-select --install` from a Terminal.";
        my.result.type = "Fatal";
        return false;
      }
    }
  </script>
  <installation-check script="installation_check()" />
</installer-gui-script>