/usr/lib/x86_64-linux-gnu/pkgconfig/capnp.pc is in libcapnp-dev 0.6.1-1ubuntu1.
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 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Cap'n Proto
Description: Insanely fast serialization system
Version: 0.6.1
Libs: -L${libdir} -lcapnp -pthread -lpthread
Libs.private: -lpthread
Requires: kj = 0.6.1
Cflags: -I${includedir} -pthread
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