upfirdn error when using resample but it says it's included?

[RT]

When I use resample I get an error with upfirdn see error below but upfirdn should be included in the signal package.  https://octave.sourceforge.io/signal/function/upfirdn.html
 
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error: 'upfirdn' undefined near line 121 column 11
error: called from
    resample at line 121 column 9

I'm using Octave version 5.1 on 64bit Ubuntu Linux

>> pkg list
Package Name  | Version | Installation directory
--------------+---------+-----------------------
     control *|   3.1.0 | /home/rt/octave/control-3.1.0
    geometry  |   3.0.0 | /home/rt/octave/geometry-3.0.0
       image  |   2.8.0 | /home/rt/octave/image-2.8.0
  quaternion *|   2.4.0 | /home/rt/octave/quaternion-2.4.0
      signal *|   1.4.0 | /home/rt/octave/signal-1.4.0