go get not working on macos

[davedbase]

Having trouble getting goczmq working on MacOS Big Sur:

Environment:

MacOS Big Sur Version 11.0.1
go version go1.15.5 darwin/amd64

Installed Prerequisites:

brew install libsodium
brew install czmq
brew install zeromq

None of the above errored and seem properly installed.

Running go get gopkg.in/zeromq/goczmq.v4 returns:

go get gopkg.in/zeromq/goczmq.v4: gopkg.in/zeromq/goczmq.v4@v4.2.0: invalid version: go.mod has non-....v4 module path "github.com/zeromq/goczmq" at revision v4.2.0

Running go get gopkg.in/zeromq/goczmq returns:

go get gopkg.in/zeromq/goczmq: unrecognized import path "gopkg.in": parse https://gopkg.in/?go-get=1: no go-import meta tags ()

[maxdebayser]

It doesn't work on Fedora Linux 33 either.