title: How to compile go program in 1.1.2 with dependencies compiled in 1.1.1?
body: <p>Every time I try to compile my program after (this morning) upgrading go from 1.1.1 to 1.1.2 (on Windows 7 64 bits), I get error message like:</p>
  
  <pre><code>C:\Users\VonC\prog\go\src\github.com\spf13\hugo&gt;go build -o hugo.exe main.go
  # github.com/spf13/hugo/hugolib
  hugolib\page.go:23: import C:\Users\VonC\prog\go\pkg\windows_amd64/github.com/emicklei/hopwatch.a: 
    object is [windows amd64 go1.1.1 X:none] 
    expected [windows amd64 go1.1.2 X:none]
  </code></pre>
  
  <p>I tried a <code>go clean -r</code>, but the error message persists?</p>
  
  <p>What is the right <code>clean</code> command to use?</p>