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

gmsh: Added occt and version bump
https://github.com/void-linux/void-packages/pull/31884

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OpenCASCADE is needed for a lot of the functionality of gmsh, and it's suggested as one of the dependencies here: https://gitlab.onelab.info/gmsh/gmsh/-/wikis/Gmsh-compilation

I think it's reasonable to compile support for it by default.