anchor.diff:      
       if [ -z "$port" ]
       then
  -        echo "Unfortunately, the emulator port space is exhausted!"
  +        echo "Unfortunately, the emulator port space is exhausted!" >&2
           exit 1
       else
  -        echo "We have a free TCP port: $port"
  +        echo "We have a free TCP port: $port" >&2
       fi
       
       export ANDROID_SERIAL="emulator-$port"
  
positive.code:     
      # We have to look for a free TCP port
      
      echo "Looking for a free TCP port in range 5554-5584"
      
      for i in $(seq 5554 2 5584)
      do
  
negative.code: {stdenv, androidsdk}:
  {name, app ? null, platformVersion ? "8", abiVersion ? "armeabi-v7a", useGoogleAPIs ? false, enableGPU ? false, package ? null, activity ? null}:
  
  assert app != null -> package != null && activity != null;
  
  let
    androidsdkComposition = androidsdk {
  