To add luci-app-radius to an OpenWRT router, see my earlier post. Many of these instructions should work on a generic OpenWRT host as well.
Nordic Boy Consulting
The online Blog for James Klaas, the Nordic Boy Computer Consultant
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Compiling luci-app-radius for the Turris Omnia
This is an outline on how luci-app-radius can be compiled for the Turris-Omnia. Non-specific instructions may work for other platforms.