https://bugs.gentoo.org/357305
http://code.google.com/p/ffmpegthumbnailer/issues/detail?id=83&can=1

--- a/libffmpegthumbnailer/filmstripfilter.cpp
+++ b/libffmpegthumbnailer/filmstripfilter.cpp
@@ -14,6 +14,7 @@
 //    along with this program; if not, write to the Free Software
 //    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+#include <cstddef>
 #include "filmstripfilter.h"
 #include "filmstrip.h"