anchor.diff:  
       src = fetchurl {
         url = "mirror://postgresql/source/v${version}/${pname}-${version}.tar.bz2";
  -      inherit sha256;
  +      inherit hash;
       };
   
       hardeningEnable = lib.optionals (!stdenv.cc.isClang) [ "pie" ];
  
positive.code:   postgresql_14 = self.callPackage generic {
      version = "14.4";
      psqlSchema = "14";
      sha256 = "sha256-wjtiN8UjHHkVEb3HkJhhfWhS6eO982Dv2LXRWho9j2o=";
      this = self.postgresql_14;
      thisAttr = "postgresql_14";
      inherit self;
  
negative.code:   postgresql_12 = self.callPackage generic {
      version = "12.11";
      psqlSchema = "12";
      hash = "sha256-ECYkil/Svur0PkxyNqyBflbVi2gaM1hWRl37x1s+gwI=";
      this = self.postgresql_12;
      thisAttr = "postgresql_12";
      inherit self;
  