/usr/lib/x86_64-linux-gnu/pkgconfig/gnutls-extra.pc is in libgnutls-dev 2.12.23-12ubuntu2.8.
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 | # Process this file with autoconf to produce a pkg-config metadata file.
# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2008, 2010 Free Software
# Foundation, Inc.
# Author: Simon Josefsson
#
# This file is free software; as a special exception the author gives
# unlimited permission to copy and/or distribute it, with or without
# modifications, as long as this notice is preserved.
#
# This file is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: GnuTLS-extra
Description: Additional add-ons for GnuTLS licensed under GPL
URL: http://www.gnu.org/software/gnutls/
Requires: gnutls
Version: 2.12.23
Libs: -L${libdir} -lgnutls-extra
Libs.private: -L${prefix}/lib/x86_64-linux-gnu -lgnutls-extra
Cflags: -I${includedir}
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