It’s pretty obvious that this does not include Jetson-specific installs, so it is of limited use. However, I found specific downloads with individual L4T downloads:
[url]https://developer.nvidia.com/linux-tegra-rel-21[/url]
…the above is of course just for R21.2 and probably will fail with R19.3.
That’s supposed to install all the dependencies using a GUI on the host PC. I’m not sure if it supports installing the dependencies to an already otherwise working system or does it want to make a full clean install.
I found the answer in the second link ( https://developer.nvidia.com/linux-tegra-rel-21 ). There is a part with OPENCV4TEGRA with a Readme and .deb files, but only one .deb file for running OPENCV on the Jetson. A quick look in the Readme showed that now only one .deb file needs to be installed. The other tools can be aquired through apt-get. Apparently the wiki is outdated.