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/usr/include/x86_64-linux-gnu/bits/printf-ldbl.h is in libc6-dev 2.15-0ubuntu10.18.

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/* -mlong-double-64 compatibility mode for <printf.h> functions.
   Copyright (C) 2006 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _PRINTF_H
# error "Never include <bits/printf-ldbl.h> directly; use <printf.h> instead."
#endif

__LDBL_REDIR_DECL (printf_size)