anchor.diff:      description = "Sophisticated calendar and alarm program for the console";
       license = stdenv.lib.licenses.gpl2;
       maintainers = with stdenv.lib.maintainers; [raskin kovirobi];
  -    platforms = with stdenv.lib.platforms; linux;
  +    platforms = with stdenv.lib.platforms; unix;
     };
   }
  
positive.code:   tclLibraries = stdenv.lib.optionals tkremind [ tcllib tk ];
    tclLibPaths = stdenv.lib.concatStringsSep " "
      (map (p: "${p}/lib/${p.libPrefix}") tclLibraries);
  in stdenv.mkDerivation {
    name = "remind-3.1.16";
    src = fetchurl {
  
negative.code:   nativeBuildInputs = optional tkremind makeWrapper;
    propagatedBuildInputs = tclLibraries;
  
    postPatch = ''
      substituteInPlace ./configure \
        --replace "sleep 1" "true"
      substituteInPlace ./src/init.c \
        --replace "rkrphgvba(0);" "" \
        --replace "rkrphgvba(1);" ""
      ${tkremindPatch}
    '';
  
    postInstall = optionalString tkremind ''
  