compiling grab.cc with Octave 4.0.o to grab.oct

[Andreas Stahel]

Dear Octave users

For my Math classes I use Octave. Using a very old  grab.cc file 
(original by Andy Adler)
allows to read data from the X11 screen. I consider this to be very useful.

For many years I compiled the code in  grab.cc by calling
mkoctfile -L/usr/X11R6/lib -lX11 -I/usr/X11R6/include/ grab.cc
and it worked like a charm.
Find the code for grab.cc at
https://staff.ti.bfh.ch/sha1/Labs/PWF/Extras/Demos/input/

The latest attempt with version 4.0.0 of octave under a Ubuntu 14.04 
system failed miserably.
I suspect a change the class definitions of Octave, but my lack of C+ 
skills prevented me from drawing any  useful conclusion from the error 
messages and the Octave manual
did not yield the information I needed.
Does any of you have a hint on how to fix the problem?

With best regards

Andreas Stahel

--
Andreas Stahel       E-Mail: address@hidden
Mathematics, BFH-TI  Phone: ++41 +32 32 16 258
Quellgasse 21        Fax:   ++41 +32 321 500
CH-2501 Biel         WWW:   https://staff.ti.bfh.ch/sha1/
Switzerland