go - How to set GOPRIVATE environment variable

Question

I started working on a Go project and it uses some private modules from Github private repos and whenever I try to run go run main.go it gives me a below 410 Gone error:

verifying github.com/repoURL/go-proto@v2.86.0+incompatible/go.mod: github.com/repoURL/go-proto@v2.86.0+incompatible/go.mod: reading https://sum.golang.org/lookup/github.com/!repoURL/go-proto@v2.86.0+incompatible: 410 Gone

I can easily clone private repo from terminal which means my ssh keys are configured correctly. I read here that I need to set GOPRIVATE environment variable but I am not sure how to do that.

Can anyone answer or point to the relevant tutorial?

Go: v1.13, OS: macOS Mojave

Answer 1

Waitting for answers