如何设置go环境变量GOPATH？

gin-gonic/gin
$ go get -u github.com/gin-gonic/gin
package github.com/gin-gonic/gin: 
  cannot download, $GOPATH not set. 
For more details see: go help gopath

echo $GOPATH
GOPATH
$ export GOPATH=$HOME/go

~/.bash_profile
$ source ~/.bash_profile 

~/.bashrc
$ source ~/.bashrc

$GOPATH
$ echo $GOPATH 
/Users/wangtom/go

参考链接:

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