anchor.diff:  
     phases = "installPhase";
   
  -  meta = {
  +  meta = with stdenv.lib; {
       description = "Minecraft Server";
  -    homepage    = "https://minecraft.net";
  -    license     = stdenv.lib.licenses.unfreeRedistributable;
  -    platforms   = stdenv.lib.platforms.unix;
  -    maintainers = with stdenv.lib.maintainers; [ thoughtpolice tomberek costrouc];
  +    homepage = "https://minecraft.net";
  +    license = licenses.unfreeRedistributable;
  +    platforms = platforms.unix;
  +    maintainers = with maintainers; [ thoughtpolice tomberek costrouc ];
     };
   }
  
positive.code: { stdenv, fetchurl, jre }:
  stdenv.mkDerivation {
    pname = "minecraft-server";
    version = "1.15.2";
  
    src = fetchurl {
      url    = "https://launcher.mojang.com/v1/objects/bb2b6b1aefcd70dfd1892149ac3a215f6c636b07/server.jar";
      sha256 = "12kynrpxgcdg8x12wcvwkxka0fxgm5siqg8qq0nnmv0443f8dkw0";
    };
  
  
negative.code: 
      cat > $out/bin/minecraft-server << EOF
      #!/bin/sh
      exec ${jre_headless}/bin/java \$@ -jar $out/lib/minecraft/server.jar nogui
      EOF
  
      chmod +x $out/bin/minecraft-server
  