There is an updated pull request by mobinmob against master on the void-packages repository

https://github.com/mobinmob/void-packages rssguard
https://github.com/void-linux/void-packages/pull/36371

rssguard: update to 4.2.1.
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A patch file from https://github.com/void-linux/void-packages/pull/36371.patch is attached