Podfile

platform :osx, '10.15'

# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'ephemeral', 'Flutter-Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure \"flutter pub get\" is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Flutter-Generated.xcconfig, then run \"flutter pub get\""
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_macos_podfile_setup

target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_macos_pods File.dirname(File.realpath(__FILE__))
  target 'RunnerTests' do
    inherit! :search_paths
  end
end

post_install do |installer|
  # Ensure pods also use the minimum deployment target set above
  # https://stackoverflow.com/a/64385584/436422
  puts 'Determining pod project minimum deployment target'

  pods_project = installer.pods_project
  deployment_target_key = 'MACOSX_DEPLOYMENT_TARGET'
  deployment_targets = pods_project.build_configurations.map{ |config| config.build_settings[deployment_target_key] }
  minimum_deployment_target = deployment_targets.min_by{ |version| Gem::Version.new(version) }

  puts 'Minimal deployment target is ' + minimum_deployment_target
  puts 'Setting each pod deployment target to ' + minimum_deployment_target

  installer.pods_project.targets.each do |target|
    flutter_additional_macos_build_settings(target)
    target.build_configurations.each do |config|
      config.build_settings[deployment_target_key] = minimum_deployment_target
    end
  end
end