hidapi : A multi-platform library for USB and Bluetooth HID-Class devices ( https://github.com/libusb/hidapi )
olm : Implementation of the olm and megolm cryptographic ratchets ( https://gitlab.matrix.org/matrix-org/olm )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a zGentoo
For Paludis use this rsync : rsync://gentoo.zugaina.org/zGentoo-portage
If you have a problem : ycarus(-at-)zugaina.org