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

https://github.com/mkohlhaas/void-packages ipe_documentation
https://github.com/void-linux/void-packages/pull/30959

ipe: generate complete documentation
https://github.com/otfried/ipe-issues/issues/389

A patch file from https://github.com/void-linux/void-packages/pull/30959.patch is attached