You most likely don't need anymore, but I needed one for Go 1.20, so I went looking and found one from 2016 on the way. If anyone needs, come [here](https://web.archive.org/web/20210701000000*/https://pkg.go.dev/golang.org/x/mobile?tab=versions) and run go install golang.org/x/mobile/cmd/gomobile@[the version you want]. Example: go install golang.org/x/mobile/cmd/[email protected] for the one I mentioned from 2016.