/usr/lib/pkgconfig/libiptc.pc is in iptables-dev 1.6.0-2ubuntu3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/lib
includedir=${prefix}/include
Name: libiptc
Description: iptables v4/v6 ruleset ADT and kernel interface
Version: 1.6.0
Requires: libip4tc libip6tc
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