anchor.diff: -{ stdenv, fetchurl, makeWrapper, glibc, readline, ncurses, groff, utillinux }:
  +{ stdenv, fetchurl, makeWrapper, glibc, readline, ncurses, utillinux }:
   
   with stdenv.lib;
   let
  
positive.code:     sha256 = "14mnz6smhi3a0rgmwvddk9w3vdisi8khq67i8nqsl47vgs8n1kqg";
    };
  
    buildInputs = [ makeWrapper readline ncurses groff utillinux ];
  
    configurePhase = ''
      sed -i 's/all: check_include/all:/' Makefile
  
negative.code:     BINDIR=$out/bin LIBDIR=$out/lib CALC_INCDIR=$out/include/calc CALC_SHAREDIR=$out/share/calc MANDIR=$out/share/man/man1 \
      USE_READLINE=-DUSE_READLINE READLINE_LIB=-lreadline READLINE_EXTRAS='-lhistory -lncurses' \
      TERMCONTROL=-DUSE_TERMIOS \
    '';
  in
  stdenv.mkDerivation rec {
  