I'm using Debian Jessie (up-to-date as of 2015-04-26) and installed everything necessary except QtHandles itself from the Debian repository (QtHandles doesn't seem to be in the Jessie repository).
I cloned the QtHandles repository at github.com/goffioul/QtHandles and built it with qmake and make, successfully.
The as root, I installed it with the install.sh script (which copied __init_qt__.oct , PKG_ADD and COPYING to
/usr/lib/x86_64-linux-gnu/octave/3.8.2/oct/x86_64-pc-linux-gnu/QtHandles)/
That's all that the README says should be necessary. But when I start Octave and type:
graphics_toolkit qt
the response is:
error: graphics_toolkit: qt toolkit is not available
error: called from:
error: /usr/share/octave/3.8.2/m/plot/util/graphics_toolkit.m at line 70, column 5
and if I type:
available_graphics_toolkits
it just lists fltk and gnuplot.
It seems I've missed out some vital step, but what? Do I have to build octave from source with some special configuration option for it to see QtHandles?