/usr/ is in libcgroup-dev 0.41-7ubuntu1.
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..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libcgroup.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libcgroup-dev/
/usr/share/doc/libcgroup-dev/copyright
/usr/include/
/usr/include/libcgroup/
/usr/include/libcgroup/log.h
/usr/include/libcgroup/error.h
/usr/include/libcgroup/config.h
/usr/include/libcgroup/init.h
/usr/include/libcgroup/iterators.h
/usr/include/libcgroup/groups.h
/usr/include/libcgroup/tasks.h
/usr/include/libcgroup.h
/usr/lib/x86_64-linux-gnu/libcgroup.so
/usr/share/doc/libcgroup-dev/changelog.Debian.gz