title: Xcode - unidentified symbols for architecture archs in libpjmedia-codec-arm-apple-darwin9.a(opencore.o)
body: <p><br>
  I really having a hard time to figure out the problem.
  i'm using <code>PJSIP</code> and also <code>opencore-amr.</code></p>
  
  <ol>
  <li>successfully compiled opencore-amr to arm64 (lipo -info told me)</li>
  <li>successfully integrate opencore-amr (arm64) with PJSIP
  (arm64),configure it, make dep, make clean and make without any
  error.</li>
  <li>when i try to compile it with XCode. it says</li>
  </ol>
  
  <p>Undefined symbols for architecture <code>arm64</code>:
    "<code>_Decoder_Interface_Decode</code>", referenced from:
        <code>_amr_codec_decode</code> in <code>libpjmedia-codec-arm-apple-darwin9.a(opencore_amr.o)</code></p>
  
  <ol start="4">
  <li>I did <code>ar-t libpjmedia-codec-arm-apple-darwin9.a</code> and the <code>opencore.o</code> inside the library is arm64.</li>
  </ol>
  
  <p>I really have no clue to solve this.
  please help me, thanks</p>
  
  <p>FYI : I've tried open core with <code>pjsip</code> for android, and no issue at all.</p>