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

https://github.com/mobinmob/void-packages fltk
https://github.com/void-linux/void-packages/pull/34213

fltk: update to 1.3.8.
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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/34213.patch is attached