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

https://github.com/mobinmob/void-packages nestopia
https://github.com/void-linux/void-packages/pull/40355

nestopia: update to 1.51.1.
Also:
- remove non-existent configure args
- add fltk-devel in makedepends.

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A patch file from https://github.com/void-linux/void-packages/pull/40355.patch is attached