title: How to install a proof-of-work proxy server on raspberry pi 3B
body: <p>I am trying to install a proof-of-work proxy server from the link: <a href="https://docs.iota.org/docs/node-software/0.1/iri/how-to-guides/install-a-pow-proxy" rel="nofollow noreferrer">https://docs.iota.org/docs/node-software/0.1/iri/how-to-guides/install-a-pow-proxy</a> on Raspberry Pi 3B. However, when I try to build an executable file at step 4, I get the following error: </p>
  
  <blockquote>
    <p>main.go:22:8: cannot find package
    "github.com/mholt/caddy/caddy/caddymain" in any of:</p>
    
    <p>/usr/lib/go/src/pkg/github.com/mholt/caddy/caddy/caddymain (from $GOROOT )</p>
    
    <p>/home/pi/go/src/github.com/mholt/caddy/caddy/caddymain (from $GOPATH)</p>
  </blockquote>