Remember WikiFormatting and see WimplicitFunctionDeclaration.
I see that the problem is in a bundled copy of libuv 1.34.2 and this makes me wonder if the port could avoid the problem by using the MacPorts copy of libuv 1.44.2 instead which would be preferable for other reasons as well.
I do not see this issue on my Monterey x86_64 system and we did not see the problem on our buildbot machines. I do see a similar report from a Ventura x86_64 user in another program that bundles libuv:
https://github.com/pytorch/pytorch/issues/101586
wren-cli 0.4.0 was released nearly two years ago and it updates the bundled libuv to 1.38.0. The port should be updated; maybe it fixes this problem.