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

graphviz: update to 2.42.2.
https://github.com/void-linux/void-packages/pull/18264

Description:
Tested build on all that depends on this. Found valadoc uses pkg-config to find libgvc, in which CMakeList.txt from graphviz does not create. Added patch to install the pkg-config files needed and added link to math for gvc and pathplan.

I have submitted this patch upstream for hopeful merge. https://gitlab.com/graphviz/graphviz/merge_requests/1322