/usr/lib/x86_64-linux-gnu/pkgconfig/capnp-rpc.pc is in libcapnp-dev 0.5.3-2ubuntu1.
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=${prefix}/include
Name: Cap'n Proto RPC
Description: Fast object-oriented RPC system
Version: 0.5.3
Libs: -L${libdir} -lcapnp-rpc -lkj-async
Requires: capnp = 0.5.3
Cflags: -I${includedir}
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