/usr/include/SFML/System/Sleep.h is in libcsfml-dev 2.1-2.
This file is owned by root:root, with mode 0o644.
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//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2013 Laurent Gomila (laurent.gom@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
#ifndef SFML_SLEEP_H
#define SFML_SLEEP_H
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/System/Export.h>
#include <SFML/System/Time.h>
////////////////////////////////////////////////////////////
/// \brief Make the current thread sleep for a given duration
///
/// sfSleep is the best way to block a program or one of its
/// threads, as it doesn't consume any CPU power.
///
/// \param duration Time to sleep
///
////////////////////////////////////////////////////////////
CSFML_SYSTEM_API void sfSleep(sfTime duration);
#endif // SFML_SLEEP_H
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