/usr/lib/x86_64-linux-gnu/pkgconfig/libidn.pc is in libidn11-dev 1.23-2ubuntu0.1.
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 | # Process this file with autoconf to produce a pkg-config metadata file.
# Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
# 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=${prefix}/include
Name: Libidn
Description: IETF stringprep, nameprep, punycode, IDNA text processing.
URL: http://www.gnu.org/software/libidn/
Version: 1.23
Libs: -L${libdir} -lidn
Libs.private:
Cflags: -I${includedir}
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