World's easiest question for anyone but me: Why is go get github.com/go-sql-driver/mysql failing?

<p>Trying to use the go-sql-driver/mysql package. When I do this:</p> <pre><code>go get github.com/go-sql-driver/mysql </code></pre> <p>I get the error <strong>package github.com/go-sql-driver/mysql: cannot download, $GOPATH not set. For more details see: go help gopath</strong></p> <p>I have read <a href="https://golang.org/doc/code.html" rel="nofollow">https://golang.org/doc/code.html</a> 72 times and seem to be missing something. Here&#39;s my config. (By the way, a &#34;hello world&#34; program works just fine.)</p> <pre><code>PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin:/usr/local/mysql/bin/:/bin GOPATH=/Users/tom/go </code></pre> <p>The program named foo.go is in:</p> <pre><code>/Users/tom/go/foo </code></pre> <p>What am I doing wrong?</p> <hr/>**评论：**<br/><br/>bbrazil: <pre><p>Are you missing an <code>export GOPATH</code>in your rc file?</p></pre>g0dsCookie: <pre><p>You need to export GOPATH, otherwise go won&#39;t know the path. </p> <p>export GOPATH=&lt;path&gt;</p> <p>or </p> <p>GOPATH=&lt;path&gt; export GOPATH</p> <p>This should go into your .bashrc and you need to reload it with source .bashrc</p></pre>-Nii-: <pre><p>Where is your config set?</p></pre>peterhellberg: <pre><p>Your program needs to be in $GOPATH/src/foo/ (or more commonly $GOPATH/src/github.com/username/foo)</p></pre>