title: using sys root for 'iPhoneSimulator' but targeting 'MacOSX' warning in NPM install
body: <p>For some reason I'm not able to do NPM install on my project anymore since I'm getting the following messages:</p>
  
  <pre><code>  SOLINK_MODULE(target) Release/.node
  clang: warning: using sysroot for 'iPhoneSimulator' but targeting 'MacOSX' [-Wincompatible-sysroot]
  ld: warning: building for macOS, but linking in .tbd file (/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.5.sdk/usr/lib/libc++.tbd) built for iOS Simulator
  ld: warning: building for macOS, but linking in .tbd file (/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.5.sdk/usr/lib/libSystem.tbd) built for iOS Simulator
  ld: warning: building for macOS, but linking in .tbd file (/usr/lib/system/libcache.dylib) built for iOS Simulator
  ld: warning: building for macOS, but linking in .tbd file (/usr/lib/system/libcommonCrypto.dylib) built for iOS Simulator
  ld: warning: building for macOS, but linking in .tbd file (/usr/lib/system/libcompiler_rt.dylib) built for iOS Simulator
  ld: warning: building for macOS, but linking in .tbd file (/usr/lib/system/libcopyfile.dylib) built for iOS Simulator
  ld: warning: bui
  </code></pre>
  
  <p>How to fix this???? I have tried uninstalling node and reinstalling node but I'm still getting the same error.</p>