Fixing that, there are incompatible pointer type errors in cmd/smyrna/polytess.c which upstream seemed to have addressed with https://gitlab.com/graphviz/graphviz/-/commit/87cc54644e40fccc0651b7fedc137b3dd02b4514 However, the patch does not apply cleanly and so it seems it would be better to simply defer fixing this until we grab a new upstream version.