'folly/Portability.h' file not found

This is my current podfile

platform :ios, '9.0'

target 'MyCoolProj' do
  # Uncomment the next line if you're using Swift or would like to use dynamic frameworks
  # use_frameworks!

  rn_path = '../node_modules/react-native'

  pod 'yoga', path: "#{rn_path}/ReactCommon/yoga"
  pod 'React', path: rn_path, subspecs: [
    'Core',
    'CxxBridge',
    'DevSupport',
    'RCTActionSheet',
    'RCTAnimation',
    'RCTGeolocation',
    'RCTImage',
    'RCTLinkingIOS',
    'RCTNetwork',
    'RCTSettings',
    'RCTText',
    'RCTVibration',
    'RCTWebSocket',
  ]
  pod 'Folly', :podspec => "#{rn_path}/third-party-podspecs/Folly.podspec"

  post_install do |installer|
    installer.pods_project.targets.each do |target|
      if target.name == "React"
        target.remove_from_project
      end
    end
  end

end

Adding the post_install is a confirmed workaround:

post_install do |installer|
    installer.pods_project.targets.each do |target|
      if target.name == "React"
        target.remove_from_project
      end
    end
  end

Leaving the issue open until we resolve the root cause (or update the doc to recommend this workaround 😄 ).

Thanks @gabrieletondi !