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/usr/include/c++/v1/complex.h is in libc++-dev 3.7.0-1.

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// -*- C++ -*-
//===--------------------------- complex.h --------------------------------===//
//
//                     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_COMPLEX_H
#define _LIBCPP_COMPLEX_H

/*
    complex.h synopsis

#include <ccomplex>

*/

#ifdef __cplusplus

#include <ccomplex>

#else  // __cplusplus

#include_next <complex.h>

#endif  // __cplusplus

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

#endif  // _LIBCPP_COMPLEX_H