xfce4 can't read USB keys or CDs

[Ray Phillips <r.phillips%uq.edu.au@localhost>]

I've installed the xfce4 package on a NetBSD/amd64 6.1.5 machine by 
downloading it and its dependencies using pkg_fetch from 
ftp://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/amd64/6.1.5/All and 
then installing it with `pkg_add xfce4'

I've discovered its File Manager won't show the contents of a CD or 
USB key (the one I tried has a FAT32 file system).

When the USB key is inserted its volume name is displayed in File 
Manager's left pane but when it's clicked a window containing this 
appears:

Failed to mount "Name-of-USB-volume".

Method "mount" with signature "ssas" on interface
"org.freedesktop.Hal.Device.Volume" doesn't exist.


When a CD is inserted and File Manager's "CD-ROM Disc" entry in the 
left pane is clicked, this error appears:

Failed to mount "CD-ROM Disc".

Given device "/org/freedesktop/Hal/devices/
cd0d" is not a volume or drive.


Have I omitted to do something obvious?


Ray