Hi, This is just for your information:The current version of the octave-quaternion package in sid/forky 2.4.0-11. Upstream versions 4.2.1 and 4.2.2 have been released recently. I have already prepared version 4.2.2-1 of the Debian package in the repository at Salsa.d.o. However, I have not uploaded it to unstable because of the build-dependency on octave-generate-html, which is now needed to build the documentation.
Best, Rafael