/usr/include/gmt/potential/okbfuns.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 49 50 51 52 53 | /*--------------------------------------------------------------------
 *	$Id: okbfuns.h 19521 2017-12-27 22:38:24Z pwessel $
 *
 *	Copyright (c) 1991-2018 by P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis and F. Wobbe
 *	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 okbfuns.h
 * \brief  
 */
#ifndef OKBFUNS_H
#define OKBFUNS_H
#include "gmt_dev.h"		/* Requires GMT to compile and link */
#include "gmt_glib.h"
struct BODY_VERTS {
	double  x, y, z;
};
struct BODY_DESC {
	unsigned int n_f, *n_v, *ind;
};
struct LOC_OR {
	double  x, y, z;
};
struct MAG_PARAM {
	double	rim[3];
} *okabe_mag_param;
struct MAG_VAR {		/* Used when only the modulus of magnetization varies */
	double	rk[3];
} *okabe_mag_var;
EXTERN_MSC double okabe (struct GMT_CTRL *GMT, double x_o, double y_o, double z_o, double rho, bool is_grav,
		struct BODY_DESC bd_desc, struct BODY_VERTS *bd_vert, unsigned int km, unsigned int pm, struct LOC_OR *loc_or);
#endif /* OKBFUNS_H */
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