/usr/lib/x86_64-linux-gnu/pkgconfig/libnl-xfrm-3.0.pc is in libnl-xfrm-3-dev 3.2.29-0ubuntu3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libnl-xfrm
Description: Netlink Routing Family Library
Version: 3.2.29
Requires: libnl-3.0
Libs: -L${libdir} -lnl-xfrm-3
Cflags: -I${includedir}/libnl3
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