/usr/lib/x86_64-linux-gnu/pkgconfig/process-cpp.pc is in libprocess-cpp-dev 3.0.1-0ubuntu2.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${exec_prefix}/include
Name: process-cpp
Description: A simple and lightweight C++11 wrapper around process control
Version: 3.0.0
Libs: -L${libdir} -lprocess-cpp
Cflags: -I${includedir}
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