title: How to fix 'boost/operators.hpp' file not found' error in react-native
body: <p>when I use 'react-native run-ios', there is some error, 'boost/operators.hpp' file not found.
  I can not build and run my project:</p>
  
  <p>react-native-cli: 2.0.1
  react-native: 0.59.9
  npm: 6.9.0
  yarn: 1.16.0
  node: v12.4.0
  os: macos 10.14.5
  xcode: 10.2.1</p>
  
  <pre><code>▸ Compiling JSIDynamic.cpp
  
  ❌  /Users/lidongbo/WorkBentch/ReactNative/AwesomeProject/node_modules/react-native/React/../third-party/folly-2018.10.22.00/folly/dynamic.h:63:10: 'boost/operators.hpp' file not found
  
  #include &lt;boost/operators.hpp&gt;
                ^
  
  
  ▸ Analyzing JSCRuntime.cpp
  ▸ Analyzing jsi.cpp
  error Failed to build iOS project. We ran "xcodebuild" command but it exited with error code 65. To debug build logs further, consider building your app with Xcode.app, by opening AwesomeProject.xcodeproj
  
  
  </code></pre>
  
  <p>project can build and run.</p>