/usr/ is in libvarconf-dev 1.0.0-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/varconf-1.0.pc
/usr/include/
/usr/include/varconf-1.0/
/usr/include/varconf-1.0/varconf/
/usr/include/varconf-1.0/varconf/variable.h
/usr/include/varconf-1.0/varconf/dyncmp.h
/usr/include/varconf-1.0/varconf/dyntypes.h
/usr/include/varconf-1.0/varconf/config.h
/usr/include/varconf-1.0/varconf/parse_error.h
/usr/include/varconf-1.0/varconf/varconf_defs.h
/usr/include/varconf-1.0/varconf/dynbase.h
/usr/include/varconf-1.0/varconf/dynvar.h
/usr/include/varconf-1.0/varconf/varconf.h
/usr/share/
/usr/share/doc/
/usr/share/doc/libvarconf-dev/
/usr/share/doc/libvarconf-dev/copyright
/usr/lib/x86_64-linux-gnu/libvarconf-1.0.so
/usr/share/doc/libvarconf-dev/changelog.Debian.gz