Keep getting curl "self signed cert" errors. How do I " import self-signed certificate"?

severely bandwidth limited, not much time to craft proper support request. apologies for brevity / lack of research.

I keep running into errors like this: cURL error 60: SSL certificate problem: self signed certificate in certificate chain (see for https://derpaderp.local/

apperently need to import self signed cert? cert lives on another machine. dont know how to do.