anchor.diff: -{ stdenv, fetchurl, ncurses, pcre, libpng, zlib, readline, libiconv }:
  +{ stdenv, fetchurl
  +, libiconv
  +, libpng
  +, ncurses
  +, pcre
  +, readline
  +, zlib
  +}:
   
   stdenv.mkDerivation rec {
  -  name = "slang-2.3.2";
  +  pname = "slang";
  +  version = "2.3.2";
  +
     src = fetchurl {
  -    url = "https://www.jedsoft.org/releases/slang/${name}.tar.bz2";
  -    sha256 = "06p379fqn6w38rdpqi98irxi2bf4llb0rja3dlgkqz7nqh7kp7pw";
  +    url = "https://www.jedsoft.org/releases/slang/${pname}-${version}.tar.bz2";
  +    sha256 = "sha256-/J47D8T2fDwfbUPJDBalxC0Re44oRXxbRoMbi1064xo=";
     };
   
     outputs = [ "out" "dev" "man" "doc" ];
  
positive.code: 
    # Fix some wrong hardcoded paths
    preConfigure = ''
      sed -i -e "s|/usr/lib/terminfo|${ncurses.out}/lib/terminfo|" configure
      sed -i -e "s|/usr/lib/terminfo|${ncurses.out}/lib/terminfo|" src/sltermin.c
      sed -i -e "s|/bin/ln|ln|" src/Makefile.in
      sed -i -e "s|-ltermcap|-lncurses|" ./configure
    '';
  
    configureFlags = [
      "--with-png=${libpng.dev}"
      "--with-z=${zlib.dev}"
      "--with-pcre=${pcre.dev}"
      "--with-readline=${readline.dev}"
    ];
  
    buildInputs = [
      pcre libpng zlib readline
    ] ++ stdenv.lib.optionals (stdenv.isDarwin) [ libiconv ];
  
    propagatedBuildInputs = [ ncurses ];
  
negative.code:   '';
  
    meta = with stdenv.lib; {
      description = "A small, embeddable multi-platform programming library";
      longDescription = ''
        S-Lang is an interpreted language that was designed from the start to be
        easily embedded into a program to provide it with a powerful extension
        language. Examples of programs that use S-Lang as an extension language
        include the jed text editor and the slrn newsreader. Although S-Lang does
        not exist as a separate application, it is distributed with a quite
        capable program called slsh ("slang-shell") that embeds the interpreter
        and allows one to execute S-Lang scripts, or simply experiment with S-Lang
        at an interactive prompt. Many of the the examples in this document are
        presented in the context of one of the above applications.
  
        S-Lang is also a programmer's library that permits a programmer to develop
        sophisticated platform-independent software. In addition to providing the
        S-Lang interpreter, the library provides facilities for screen management,
        keymaps, low-level terminal I/O, etc. However, this document is concerned
        only with the extension language and does not address these other features
        of the S-Lang library. For information about the other components of the
        library, the reader is referred to the S-Lang Library C Programmer's
        Guide.
      '';
      homepage = "http://www.jedsoft.org/slang/";
      license = licenses.gpl2Plus;
      maintainers = with maintainers; [ AndersonTorres ];
      platforms = platforms.unix;
    };
  }
  