title: Xcode 10 Error: linker command failed with exit code 1
body: <p>I just updated my Xcode to Xcode 10 and now my project will not run and I get the error:</p>
  
  <p><code>ld: library not found for -lstdc++.6
  clang: error: linker command failed with exit code 1 (use -v to see invocation)</code></p>
  
  <p>I do not know what this means and how to fix it. I tried googling everywhere for the answer and came up with nothing. How can I fix this?</p>