anchor.diff:  , pngSupport ? true, libpng
   }:
   
  -stdenv.mkDerivation rec {
  +gcc9Stdenv.mkDerivation rec {
     pname = "fim";
     version = "0.6";
   
  
positive.code: { stdenv, fetchurl, autoconf, automake, pkgconfig
  , perl, flex, bison, readline, libexif
  , x11Support ? true, SDL
  , svgSupport ? true, inkscape
  
negative.code:     ++ optional jpegSupport libjpeg
      ++ optional pngSupport libpng;
  
    NIX_CFLAGS_COMPILE = lib.optionalString x11Support "-lSDL";
  
    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
  