anchor.diff:      ++ optional jpegSupport libjpeg
       ++ optional pngSupport libpng;
   
  -  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString x11Support "-lSDL";
  +  NIX_CFLAGS_COMPILE = lib.optionalString x11Support "-lSDL";
   
  -  meta = with stdenv.lib; {
  +  meta = with lib; {
       description = "A lightweight, highly customizable and scriptable image viewer";
       longDescription = ''
         FIM (Fbi IMproved) is a lightweight, console based image viewer that aims
  
positive.code: , pngSupport ? true, libpng
  }:
  
  stdenv.mkDerivation rec {
    pname = "fim";
    version = "0.6";
  
  
negative.code: { gcc9Stdenv, fetchurl, autoconf, automake, pkgconfig, lib
  , perl, flex, bison, readline, libexif
  , x11Support ? true, SDL
  , svgSupport ? true, inkscape
  