/usr/lib/x86_64-linux-gnu/pkgconfig/tinyxml2.pc is in libtinyxml2-dev 2.2.0-1.1ubuntu1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: TinyXML2
Description: simple, small, C++ XML parser
Version: 2.2.0
Libs: -L${libdir} -ltinyxml2
Cflags: -I${includedir}
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