anchor.diff: -{ lib, stdenv, fetchFromGitHub, v8, perl, postgresql }:
  +{ lib, stdenv, fetchFromGitHub, v8, perl, postgresql
  +# For test
  +, runCommand, coreutils, gnugrep }:
   
  -stdenv.mkDerivation rec {
  +let self = stdenv.mkDerivation rec {
     pname = "plv8";
     version = "3.0.0";
   
  
positive.code:     "-DJSONB_DIRECT_CONVERSION" "-DV8_COMPRESS_POINTERS=1" "-DV8_31BIT_SMIS_ON_64BIT_ARCH=1"
    ];
  
    meta = with lib; {
      description = "V8 Engine Javascript Procedural Language add-on for PostgreSQL";
      homepage = "https://plv8.github.io/";
  
negative.code:     platforms = [ "x86_64-linux" ];
      license = licenses.postgresql;
    };
  }; in self
  