Octave 4.0.0 in Mint 18.3 the ubiquitous warnings

[lascott]

As a common example:

warning: missing semicolon near line 80, column 11 in file
'/usr/share/octave/4.0.0/m/plot/draw/private/__plt__.m'
warning: called from
    plot at line 215 column 3
    myroutine at line 87 column 23
warning: missing semicolon near line 86, column 9 in file
'/usr/share/octave/4.0.0/m/plot/draw/private/__plt__.m'
warning: concatenation of different character string types may have
unintended consequences

Now these are the private internal plot routines, and these are appearing
everywhere.

warning ("off", "Octave:language-extension");
warning ("off", "Octave:mixed-string-concat");

Seems to work for one or two calls, but gets reset from within to "on".

Any thoughts most appreciated.


-Version-
Kernel          : Linux 4.10.0-38-generic (x86_64)
Compiled                : #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017
C Library               : Unknown
Default C Compiler              : GNU C Compiler version 5.4.0 20160609 (Ubuntu
5.4.0-6ubuntu1~16.04.5) 
Distribution            : Linux Mint 18.3 Sylvia
-Current Session-
Computer Name           : Beckett
User Name               : louis (louis)
Home Directory          : /home/louis
Desktop Environment             : XFCE 4
-Misc-
Uptime          : 2 days, 3 hours and 42 minutes
Load Average            : 0.66, 0.82, 0.87




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