jlink : Tools for Segger J-Link JTAG adapters ( https://www.segger.com/jlink-software.html )
libftd2xx : Library that allows a direct access to a USB device ( https://www.ftdichip.com/drivers/d2xx-drivers/ )
squareline-studio : Visual drag-and-drop UI editor for LVGL ( https://squareline.io )
urjtag : Tool for communicating over JTAG with flash chips, CPUs, and many more ( https://urjtag.sourceforge.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a vowstar
For Paludis use this rsync : rsync://gentoo.zugaina.org/vowstar-portage
If you have a problem : ycarus(-at-)zugaina.org