anchor.diff:      "--enable-largefile"
       "--disable-internal-docs"
       "--disable-docs"
  -    (wtFlag "jpeg" (libjpeg-turbo_1-4 != null) null)
  +    "--${boolWt (libjpeg-turbo_1-4 != null)}-jpeg"
       "--with-camlibs=all"
     ];
   
  -  meta = with stdenv.lib; {
  +  passthru = {
  +    srcVerification = fetchurl rec {
  +      inherit (src)
  +        outputHash
  +        outputHashAlgo
  +        urls;
  +      pgpsigUrls = map (n: "${n}.asc") src.urls;
  +      # Marcus Meissner
  +      pgpKeyFingerprint = "7C4A FD61 D8AA E757 0796  A517 2209 D690 2F96 9C95";
  +      failEarly = true;
  +    };
  +  };
  +
  +  meta = with lib; {
       description = "A library for accessing digital cameras";
       homepage = http://www.gphoto.org/proj/libgphoto2/;
       license = licenses.gpl2;
  
positive.code: }:
  
  let
    inherit (stdenv.lib)
      wtFlag;
  in
  
  stdenv.mkDerivation rec {
    name = "libgphoto2-2.5.10";
  
    src = fetchurl {
      url = "mirror://sourceforge/gphoto/${name}.tar.bz2";
      sha256 = "8d8668d432ba595c7466442aec2cf553bdf8782ec171291dbc65717c633a4ef2";
    };
  
    nativeBuildInputs = [
  
negative.code: , fetchurl
  , flex
  , gettext
  , lib
  , libtool
  
  , libexif
  