/usr/include/wcslib-4.20/wcsmath.inc is in wcslib-dev 4.20-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* WCSLIB 4.20 - an implementation of the FITS WCS standard.
* Copyright (C) 1995-2013, Mark Calabretta
*
* This file is part of WCSLIB.
*
* WCSLIB 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 3 of the License, or
* (at your option) any later version.
*
* WCSLIB 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 WCSLIB. If not, see http://www.gnu.org/licenses.
*
* Direct correspondence concerning WCSLIB to mark@calabretta.id.au
*
* Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
* http://www.atnf.csiro.au/people/Mark.Calabretta
* $Id: wcsmath.inc,v 4.20 2013/12/18 05:42:50 mcalabre Exp $
*=======================================================================
* The value used to represent an undefined parameter.
DOUBLE PRECISION UNDEFINED
PARAMETER (UNDEFINED = 987654321.0D99)
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