anchor.diff: -{ lib, stdenv
  +{ lib
  +, stdenv
   , fetchurl
   , gmp
   , mpir
  
positive.code:   version = "2.8.0";
  
    src = fetchurl {
      url = "http://www.flintlib.org/flint-${version}.tar.gz";
      sha256 = "sha256-WEI1zcOdd52ZIOrvFv4ITzwm/+7qADo//2SiCg8zRJ4=";
    };
  
  
negative.code:   ];
  
    doCheck = true;
  
    meta = with lib; {
      description = "Fast Library for Number Theory";
      license = licenses.gpl2Plus;
      maintainers = teams.sage.members;
      platforms = platforms.unix;
      homepage = "https://www.flintlib.org/";
      downloadPage = "https://www.flintlib.org/downloads.html";
      updateWalker = true;
    };
  }
  