anchor.diff:      owner = "psycopg";
       repo = pname;
       rev = version;
  -    hash = "sha256-1Wtp0wDuS6dxa1+u6DXu9fDLU7OtgsCUdbdcO5nhkxU=";
  +    hash = "sha256-jKhpmCcDi7FyMSpn51eSukFvmu3yacNovmRYG9jnu3g=";
     };
   
     outputs = [
  
positive.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , fetchpatch
  , fetchurl
  , pythonOlder
  , substituteAll
  
negative.code:     (substituteAll {
        src = ./libpq.patch;
        libpq = "${postgresql.lib}/lib/libpq.so";
      })
    ];
  
  