/usr/lib/x86_64-linux-gnu/pkgconfig/libcgroup.pc is in libcgroup-dev 0.41-7ubuntu1.
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=${prefix}
libdir=/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libcgroup
Description: Control Group Configuration Library
Version: 0.41
Libs: -L${libdir} -lcgroup
Cflags: -I${includedir}
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