title: Specify Go build flag "-H=windowsgui" in code comment
body: <p>I am creating a desktop Windows application in Go. Currently I use this line to install it:</p>
  
  <p><code>go install -ldflags -H=windowsgui</code></p>
  
  <p>I want users to be able to just say</p>
  
  <p><code>go get github.com/my/app</code></p>
  
  <p>and automatically have the <code>windowsgui</code> flag specified for building. Is it possible to add the flag as a code comment, like <code>#cgo</code> comments. Or would I have to provide a <code>make</code> file in the project directory like in the old days of Go? Or is it not possible at all?</p>