/usr/lib/x86_64-linux-gnu/pkgconfig/libip6tc.pc is in libip6tc-dev 1.6.1-2ubuntu2.
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=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libip6tc
Description: iptables IPv6 ruleset ADT and kernel interface
Version: 1.6.1
Libs: -L${libdir} -lip6tc
Cflags: -I${includedir}
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