libcsfml-system2 2.1-2 (amd64 binary) in ubuntu vivid

 SFML is a modern multimedia library offering a wide range of subsystems
 useful to produce a multimedia app. It offers OpenGL integration for
 Hardware accelerated Graphics, Windowing and Input support, Audio and
 Network facilities and supports GNU/Linux, MS Windows and Mac OS X.
 CSFML provides the bindings needed to use SFML with the C programming
 language.
 .
 The system library brings useful system utilities like multithreading and
 UNICODE handling