Control Package Error

[Thomas D. Dean]

Octave from sources, yesterday.

GNU Octave, version 4.1.0+

octave:1> pkg load control
octave:2> pkg list
Package Name       | Version | Installation directory
-------------------+---------+-----------------------
          control *|   3.0.0 | /home/tomdean/octave/control-3.0.0
          general  |   2.0.0 | /home/tomdean/octave/general-2.0.0
         geometry  |   2.1.1 | /home/tomdean/octave/geometry-2.1.1
            image  |   2.4.1 | /home/tomdean/octave/image-2.4.1
image-acquisition  |   0.2.2 | /home/tomdean/octave/image-acquisition-0.2.2
               io  |   2.4.1 | /home/tomdean/octave/io-2.4.1
   linear-algebra  |   2.2.2 | /home/tomdean/octave/linear-algebra-2.2.2
          mapping  |   1.2.1 | /home/tomdean/octave/mapping-1.2.1
    miscellaneous  |   1.2.1 | /home/tomdean/octave/miscellaneous-1.2.1
              ocs  |   0.1.5 | /home/tomdean/octave/ocs-0.1.5
           odebvp  |   1.0.6 | /home/tomdean/octave/odebvp-1.0.6
           odepkg  |   0.8.5 | /home/tomdean/octave/odepkg-0.8.5
            optim  |   1.5.1 | /home/tomdean/octave/optim-1.5.1
       quaternion  |   2.4.0 | /home/tomdean/octave/quaternion-2.4.0
           signal  |   1.3.2 | /home/tomdean/octave/signal-1.3.2
          specfun  |   1.1.0 | /home/tomdean/octave/specfun-1.1.0
       statistics  |   1.2.4 | /home/tomdean/octave/statistics-1.2.4
           struct  |  1.0.13 | /home/tomdean/octave/struct-1.0.13
         symbolic  |   2.3.0 | /home/tomdean/octave/symbolic-2.3.0
octave:3> s=tf('s')
error: '__lti_input_idx__' undefined near line 211 column 30
error: called from
    tf at line 211 column 28
    tf at line 197 column 11


What am I doing wrong?

Tom Dean