Go从命令行运行，但不能从IntelliJ Idea Go运行

Question

Under Mac OS X I did a brew install go. I also downloaded the Go IntelliJ IDE from here

http://go-ide.com/2011/08/09/goide_release_1_0_darwin.html

The following program compiles and runs fine from the command line, but if I use the GO IntelliJ IDE it gives an error:

can't find import: math/rand

import time seems ok, but Duration and time.Millisecond are undefined. If I remove these things and just run the "Hello World version" the program compiles and runs fine.

/**
 * Created by IntelliJ IDEA.
 * User: idf
 * Date: 4/2/14
 * Time: 1:59 PM
 * To change this template use File | Settings | File Templates.
 */

package main

import (
  "fmt"
  "math/rand" /* causes problems */
  "time"
)

func main() {

    sleep := time.Duration(200) /* error: undefined: time.Duration */
    time.Sleep(sleep * time.Millisecond) /* error: undefined: time.Millisecond */


    rand.Intn(1000)

    fmt.Println("Hello World")
}

Answer 1

Updated:
You'll need to add your GOROOT and GOPATH: https://github.com/go-lang-plugin-org/go-lang-idea-plugin/blob/master/Missing%20ENV.md

the exact commands I ran (obviously, your GOPATH and GOROOT will be different):

launchctl setenv GOPATH /Users/wfreeman/gocode
launchctl setenv GOROOT /Users/wfreeman/go1.2