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

https://github.com/karl-nilsson/void-packages clipper-fix
https://github.com/void-linux/void-packages/pull/26856

clipper: fix pkg-config file
Add version to configure_args, so it can propagate to polyclipping.pc

A patch file from https://github.com/void-linux/void-packages/pull/26856.patch is attached