/usr/include/wcslib-4.20/wcshdr.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: wcshdr.inc,v 4.20 2013/12/18 05:42:50 mcalabre Exp $
*=======================================================================
*     Functions.
      EXTERNAL  WCSBDX, WCSBTH, WCSIDX, WCSPIH, WCSTAB, WCSVCOPY,
     :          WCSVFREE
      INTEGER   WCSBDX, WCSBTH, WCSIDX, WCSPIH, WCSTAB, WCSVCOPY,
     :          WCSVFREE
*     Flag bits for the RELAX argument.
      INTEGER   WCSHDR_all, WCSHDR_ALLIMG, WCSHDR_AUXIMG,
     :          WCSHDR_BIMGARR, WCSHDR_CD00i00j, WCSHDR_CNAMn,
     :          WCSHDR_CROTAia, WCSHDR_DOBSn, WCSHDR_EPOCHa,
     :          WCSHDR_IMGHEAD, WCSHDR_LONGKEY, WCSHDR_none,
     :          WCSHDR_PC00i00j, WCSHDR_PIXLIST, WCSHDR_PROJPn,
     :          WCSHDR_RADECSYS, WCSHDR_reject, WCSHDR_VELREFa,
     :          WCSHDR_VSOURCE
      PARAMETER (WCSHDR_none     = 0)
      PARAMETER (WCSHDR_all      = 2**20 - 1)
      PARAMETER (WCSHDR_reject   = 2**28)
      PARAMETER (WCSHDR_CROTAia  = 2**0)
      PARAMETER (WCSHDR_EPOCHa   = 2**1)
      PARAMETER (WCSHDR_VELREFa  = 2**2)
      PARAMETER (WCSHDR_CD00i00j = 2**3)
      PARAMETER (WCSHDR_PC00i00j = 2**4)
      PARAMETER (WCSHDR_PROJPn   = 2**5)
      PARAMETER (WCSHDR_RADECSYS = 2**6)
      PARAMETER (WCSHDR_VSOURCE  = 2**7)
      PARAMETER (WCSHDR_DOBSn    = 2**8)
      PARAMETER (WCSHDR_LONGKEY  = 2**9)
      PARAMETER (WCSHDR_CNAMn    = 2**10)
      PARAMETER (WCSHDR_AUXIMG   = 2**11)
      PARAMETER (WCSHDR_ALLIMG   = 2**12)
      PARAMETER (WCSHDR_IMGHEAD  = 2**16)
      PARAMETER (WCSHDR_BIMGARR  = 2**17)
      PARAMETER (WCSHDR_PIXLIST  = 2**18)
*     Error codes and messages.
      INTEGER   WCSHDRERR_BAD_TABULAR_PARAMS, WCSHDRERR_MEMORY,
     :          WCSHDRERR_NULL_POINTER, WCSHDRERR_PARSER,
     :          WCSHDRERR_SUCCESS
      PARAMETER (WCSHDRERR_SUCCESS            = 0)
      PARAMETER (WCSHDRERR_NULL_POINTER       = 1)
      PARAMETER (WCSHDRERR_MEMORY             = 2)
      PARAMETER (WCSHDRERR_BAD_TABULAR_PARAMS = 3)
      PARAMETER (WCSHDRERR_PARSER             = 4)
      CHARACTER WCSHDR_ERRMSG(0:3)*80
      COMMON /WCSHDR_DATA/ WCSHDR_ERRMSG
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