Glad to hear someone's building our packages themselves!
Yes, we're most of the way through migrating to a more platform independent build system that will let us use these packages on the qrb5165 platform as well. This is one of the things we've had to change, the next voxl system image will have a tweak allowing these packages, but if you want to install them in the meantime, you can manually add the tweak by adding the line arch arm64 7 to /etc/opkg/arch.conf on your voxl and running opkg update