title: Go error "undefined: sync.Pool" when installing go-mtpfs
body: <p>Running the command</p>
  
  <pre><code>sudo go get github.com/hanwen/go-mtpfs
  </code></pre>
  
  <p>I get the following output:</p>
  
  <pre><code>/usr/lib/go/src/pkg/github.com/hanwen/go-fuse/fuse/bufferpool.go:41: undefined: sync.Pool
  /usr/lib/go/src/pkg/github.com/hanwen/go-fuse/fuse/bufferpool.go:54: undefined: sync.Pool
  /usr/lib/go/src/pkg/github.com/hanwen/go-fuse/fuse/server.go:44: undefined: sync.Pool
  /usr/lib/go/src/pkg/github.com/hanwen/go-fuse/fuse/server.go:47: undefined: sync.Pool
  </code></pre>
  
  <p>What does this mean? How can I fix this?</p>