There is a new pull request by steinex against master on the void-packages repository

https://github.com/steinex/void-packages i2pd
https://github.com/void-linux/void-packages/pull/42409

i2pd: restrict /etc/i2pd permissions
It's not a good idea to have /etc/i2pd/*.conf world-readable since it may contain sensitive information

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A patch file from https://github.com/void-linux/void-packages/pull/42409.patch is attached