anchor.diff:      runHook postInstall
     '';
   
  +  preFixup = ''
  +    echo "Fixing pkg-config files"
  +    sed -i "s|prefix=.*|prefix=$out/sgxsdk|g" $out/sgxsdk/pkgconfig/*.pc
  +  '';
  +
     doInstallCheck = true;
     installCheckInputs = [ which ];
     installCheckPhase = ''
  
positive.code:     perl
      python3
      texinfo
    ];
  
    buildInputs = [
  
negative.code: , perl
  , python3
  , texinfo
  , validatePkgConfig
  , which
  , writeShellScript
  }:
  