title: libstdc++.6.dylib not found when creating static library in xCode
body: <p>I'm trying to rebuild an old app (still available on the store) to change some minor settings. I re-opened the project I didn't touch for a couple of years and when trying to build it I have the following error : </p>
  
  <p><code>/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: can't open file : /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.2.sdk/usr/lib/libstdc++.6.dylib (No such file or Directory)</code></p>
  
  <p>I have this error building a static library used by the app. Any idea ?</p>