/usr/ is in liboil0.3-dev 0.3.17-2ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/bin/
/usr/bin/oil-bugreport
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/share/
/usr/share/doc/
/usr/share/doc/liboil0.3-dev/
/usr/share/doc/liboil0.3-dev/copyright
/usr/include/
/usr/include/liboil-0.3/
/usr/include/liboil-0.3/liboil/
/usr/include/liboil-0.3/liboil/liboilgcc.h
/usr/include/liboil-0.3/liboil/liboilinternal.h
/usr/include/liboil-0.3/liboil/liboiltest.h
/usr/include/liboil-0.3/liboil/liboil.h
/usr/include/liboil-0.3/liboil/liboilrandom.h
/usr/include/liboil-0.3/liboil/liboilfault.h
/usr/include/liboil-0.3/liboil/liboilutils.h
/usr/include/liboil-0.3/liboil/liboilparameter.h
/usr/include/liboil-0.3/liboil/liboil-stdint.h
/usr/include/liboil-0.3/liboil/liboilcpu.h
/usr/include/liboil-0.3/liboil/liboiltypes.h
/usr/include/liboil-0.3/liboil/liboilfuncs.h
/usr/include/liboil-0.3/liboil/liboilfunction.h
/usr/include/liboil-0.3/liboil/liboilclasses.h
/usr/include/liboil-0.3/liboil/liboilprototype.h
/usr/include/liboil-0.3/liboil/liboilprofile.h
/usr/include/liboil-0.3/liboil/liboildebug.h
/usr/lib/x86_64-linux-gnu/pkgconfig/liboil-0.3.pc
/usr/lib/x86_64-linux-gnu/liboil-0.3.a
/usr/share/doc/liboil0.3-dev/AUTHORS
/usr/share/doc/liboil0.3-dev/NEWS.gz
/usr/share/doc/liboil0.3-dev/README
/usr/share/doc/liboil0.3-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/liboil-0.3.so