/usr/ is in libcork-dev 0.15.0+ds-12.
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..
/usr/include/
/usr/include/libcork/
/usr/include/libcork/cli/
/usr/include/libcork/cli/commands.h
/usr/include/libcork/cli.h
/usr/include/libcork/config/
/usr/include/libcork/config/arch.h
/usr/include/libcork/config/bsd.h
/usr/include/libcork/config/config.h
/usr/include/libcork/config/gcc.h
/usr/include/libcork/config/linux.h
/usr/include/libcork/config/macosx.h
/usr/include/libcork/config/version.h
/usr/include/libcork/config.h
/usr/include/libcork/core/
/usr/include/libcork/core/allocator.h
/usr/include/libcork/core/api.h
/usr/include/libcork/core/attributes.h
/usr/include/libcork/core/byte-order.h
/usr/include/libcork/core/callbacks.h
/usr/include/libcork/core/error.h
/usr/include/libcork/core/gc.h
/usr/include/libcork/core/hash.h
/usr/include/libcork/core/id.h
/usr/include/libcork/core/mempool.h
/usr/include/libcork/core/net-addresses.h
/usr/include/libcork/core/timestamp.h
/usr/include/libcork/core/types.h
/usr/include/libcork/core/u128.h
/usr/include/libcork/core.h
/usr/include/libcork/ds/
/usr/include/libcork/ds/array.h
/usr/include/libcork/ds/bitset.h
/usr/include/libcork/ds/buffer.h
/usr/include/libcork/ds/dllist.h
/usr/include/libcork/ds/hash-table.h
/usr/include/libcork/ds/managed-buffer.h
/usr/include/libcork/ds/ring-buffer.h
/usr/include/libcork/ds/slice.h
/usr/include/libcork/ds/stream.h
/usr/include/libcork/ds.h
/usr/include/libcork/helpers/
/usr/include/libcork/helpers/errors.h
/usr/include/libcork/helpers/gc.h
/usr/include/libcork/helpers/posix.h
/usr/include/libcork/os/
/usr/include/libcork/os/files.h
/usr/include/libcork/os/process.h
/usr/include/libcork/os/subprocess.h
/usr/include/libcork/os.h
/usr/include/libcork/threads/
/usr/include/libcork/threads/atomics.h
/usr/include/libcork/threads/basics.h
/usr/include/libcork/threads.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libcork.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libcork-dev/
/usr/share/doc/libcork-dev/copyright
/usr/lib/x86_64-linux-gnu/libcork.so
/usr/share/doc/libcork-dev/README.markdown
/usr/share/doc/libcork-dev/changelog.Debian.gz