There is an updated pull request by Nyx70 against master on the void-packages repository

https://github.com/Nyx70/void-packages qgis
https://github.com/void-linux/void-packages/pull/27041

[WIP] New package: qgis-3.16.x 
**Help wanted**


[https://github.com/void-linux/void-packages/issues/9180](https://github.com/void-linux/void-packages/issues/9180)

TODO

- [x] New package: libkml [#26727](https://github.com/void-linux/void-packages/pull/26727)
- [x] New package: libspatialite [#28053](https://github.com/void-linux/void-packages/pull/28053)
- [x] proj: update
- [x] New package: proj-data *
- [x] New package: python3-pyproj
- [x] qscintilla-qt5: update
- [x] New package: python3-PyQt5-Qsci
  - [x] python3-PyQt5-Qsci: x86_64*
  - [ ] python3-PyQt5-Qsci: i686*
  - [ ] python3-PyQt5-Qsci: aarch64*
  - [ ] python3-PyQt5-Qsci: arm*
- [x] New package: python3-OWSLib
- [x] libgdal: update
  - [x] libgdal: postgresql & kml support
  - [x] libgdal: OSM support (spatialite)
  - [ ] libgdal: aarch64
  - [ ] libgdal: arm
- [X] New package: qgis
  - [x] qgis: uptate to 3.16.2
  - [x] qgis: uptate to 3.16.3
  - [x] qgis: temporary SIP5 / SIP6 patch
  - [ ] qgis-server
- [ ] ...

A patch file from https://github.com/void-linux/void-packages/pull/27041.patch is attached