Traté de importar unos paquetes del curso de singles page aplication y me aprece este error relacionado con $GOROOT y $GOPATH ¿cuál sería la ubicación correcta de estas variables del sistema?

        C:\Go\src\github.com\labstack\echo\middleware (from $GOROOT)
        C:\Users\User\go\src\github.com\labstack\echo\middleware (from $GOPATH)
start.go:6:2: cannot find package "github.com/labstack/gommon/log" in any of:
        C:\Go\src\github.com\labstack\gommon\log (from $GOROOT)
        C:\Users\User\go\src\github.com\labstack\gommon\log (from $GOPATH)
ws.go:8:2: cannot find package "github.com/olahol/melody" in any of:
        C:\Go\src\github.com\olahol\melody (from $GOROOT)
        C:\Users\User\go\src\github.com\olahol\melody (from $GOPATH)