There's a closed pull request on the void-packages repository

[WIP] New package: SystemPreferences-1.1.0
https://github.com/void-linux/void-packages/pull/27250

Description:
GNUstep system preferences manager.  It is required for configuring the indexing feature for [GWorkspace](http://gnustep.org/experience/GWorkspace.html).
Help would be appreciated on how to handle the library that comes included.