anchor.diff: -{ stdenv, fetchurl, ncurses
  +{ stdenv, fetchurl
  +, ncurses
   , withLibrary ? false, libtool
   , unicodeSupport ? true
   , enableShared ? !stdenv.isDarwin
  
positive.code: 
    installTargets = [ "install${stdenv.lib.optionalString withLibrary "-full"}" ];
  
    meta = {
      homepage = "https://invisible-island.net/dialog/dialog.html";
      description = "Display dialog boxes from shell";
      license = stdenv.lib.licenses.lgpl21Plus;
      maintainers = [ stdenv.lib.maintainers.spacefrogg ];
      platforms = stdenv.lib.platforms.all;
    };
  }
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "dialog";
    version = "1.3-20201126";
  
    src = fetchurl {
      urls = [
        "ftp://ftp.invisible-island.net/dialog/${pname}-${version}.tgz"
        "https://invisible-mirror.net/archives/dialog/${pname}-${version}.tgz"
      ];
      sha256 = "sha256-ySM6bI6jOlniN45RRq4r0TtRl0TP22R690IK2sWtOGY=";
    };
  
    buildInputs = [ ncurses ];
  