anchor.diff:        systems.
       '';
       homepage = "https://www.mirbsd.org/mksh.htm";
  -    license = stdenv.lib.licenses.free;
  +    license = licenses.free;
       maintainers = [ maintainers.AndersonTorres ];
       platforms = platforms.unix;
     };
  
positive.code: { stdenv, fetchurl, groff }:
  
  with stdenv.lib;
  stdenv.mkDerivation rec {
  
    name = "mksh-${version}";
    version = "R50d";
  
    src = fetchurl {
      urls = [
        "http://www.mirbsd.org/MirOS/dist/mir/mksh/${name}.tgz"
        "http://pub.allbsd.org/MirOS/dist/mir/mksh/${name}.tgz"
      ];
      sha256 = "10prcdffwziksq9sw96c1r09h4kg2zwznybrggzmjfa6l4k8h9m2";
    };
  
    buildInputs = [ groff ];
  
negative.code:     install -D -m 644 dot.mkshrc $out/share/mksh/mkshrc
    '';
  
    meta = with stdenv.lib; {
      inherit version;
      description = "MirBSD Korn Shell";
      longDescription = ''
        The MirBSD Korn Shell is a DFSG-free and OSD-compliant (and OSI
  