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/usr/include/c++/v1/ciso646 is in libc++-dev 6.0-2.

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// -*- C++ -*-
//===--------------------------- ciso646 ----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_CISO646
#define _LIBCPP_CISO646

/*
    ciso646 synopsis

*/

#include <__config>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

#endif  // _LIBCPP_CISO646