/usr/include/SFML/ is in libcsfml-dev 1.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/SFML/Audio/
/usr/include/SFML/Audio.h
/usr/include/SFML/Audio/Listener.h
/usr/include/SFML/Audio/Music.h
/usr/include/SFML/Audio/Sound.h
/usr/include/SFML/Audio/SoundBuffer.h
/usr/include/SFML/Audio/SoundBufferRecorder.h
/usr/include/SFML/Audio/SoundRecorder.h
/usr/include/SFML/Audio/SoundStatus.h
/usr/include/SFML/Audio/SoundStream.h
/usr/include/SFML/Audio/Types.h
/usr/include/SFML/Config.h
/usr/include/SFML/Graphics/
/usr/include/SFML/Graphics.h
/usr/include/SFML/Graphics/BlendMode.h
/usr/include/SFML/Graphics/Color.h
/usr/include/SFML/Graphics/Font.h
/usr/include/SFML/Graphics/Glyph.h
/usr/include/SFML/Graphics/Image.h
/usr/include/SFML/Graphics/PostFX.h
/usr/include/SFML/Graphics/Rect.h
/usr/include/SFML/Graphics/RenderWindow.h
/usr/include/SFML/Graphics/Shape.h
/usr/include/SFML/Graphics/Sprite.h
/usr/include/SFML/Graphics/String.h
/usr/include/SFML/Graphics/Types.h
/usr/include/SFML/Graphics/View.h
/usr/include/SFML/Network/
/usr/include/SFML/Network.h
/usr/include/SFML/Network/Ftp.h
/usr/include/SFML/Network/Http.h
/usr/include/SFML/Network/IPAddress.h
/usr/include/SFML/Network/Packet.h
/usr/include/SFML/Network/Selector.h
/usr/include/SFML/Network/SocketStatus.h
/usr/include/SFML/Network/SocketTCP.h
/usr/include/SFML/Network/SocketUDP.h
/usr/include/SFML/Network/Types.h
/usr/include/SFML/System/
/usr/include/SFML/System.h
/usr/include/SFML/System/Clock.h
/usr/include/SFML/System/Mutex.h
/usr/include/SFML/System/Randomizer.h
/usr/include/SFML/System/Sleep.h
/usr/include/SFML/System/Thread.h
/usr/include/SFML/System/Types.h
/usr/include/SFML/Window/
/usr/include/SFML/Window.h
/usr/include/SFML/Window/Context.h
/usr/include/SFML/Window/Event.h
/usr/include/SFML/Window/Input.h
/usr/include/SFML/Window/OpenGL.h
/usr/include/SFML/Window/Types.h
/usr/include/SFML/Window/VideoMode.h
/usr/include/SFML/Window/Window.h
/usr/include/SFML/Window/WindowHandle.h