fs/qnx4/Kconfig v3.0-rc7

QNX4FS_FS

QNX4 file system support (read only)

This is the file system used by the real-time operating systems
QNX 4 and QNX 6 (the latter is also called QNX RTP).
Further information is available at <http://www.qnx.com/>.
Say Y if you intend to mount QNX hard disks or floppies.

To compile this file system support as a module, choose M here: the
module will be called qnx4.

If you don't know whether you need it, then you don't need it:
answer N.