/usr/include/gmt/declspec.h is in libgmt-dev 5.4.3+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48  | /*--------------------------------------------------------------------
 *
 *  $Id: declspec.h 19521 2017-12-27 22:38:24Z pwessel $
 *
 *  Copyright (c) 1991-2018 by P. Wessel, W. H. F. Smith, R. Scharroo,
 *  F. Wobbe, and J. Luis
 *  See LICENSE.TXT file for copying and redistribution conditions.
 *
 *  This program 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; version 3 or any later version.
 *
 *  This program 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.
 *
 *  Contact info: gmt.soest.hawaii.edu
 *--------------------------------------------------------------------
 */
/*!
 * \file declspec.h
 * \brief Declarations for linking to DLLs
 */
#ifndef _DECLSPEC_H_
#	define _DECLSPEC_H_
/*
 * When an application links to a DLL in Windows, the symbols that
 * are imported have to be identified as such.
 */
#	ifdef _WIN32
#		ifdef LIBRARY_EXPORTS
#			define LIBSPEC __declspec(dllexport)
#		else
#			define LIBSPEC __declspec(dllimport)
#		endif /* ifdef LIBRARY_EXPORTS */
#	else /* ifdef _WIN32 */
#		define LIBSPEC
#	endif /* ifdef _WIN32 */
/* By default, we use the standard "extern" declarations. */
#	define EXTERN_MSC extern LIBSPEC
#endif /* _DECLSPEC_H_ */
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