如果golang文件具有Asset函数的依赖关系，如何构建

I have the below Golang file:

**main.go**

func indexPage(w http.ResponseWriter, r *http.Request) {
    var (
        data []byte
        err  error
    )
    if ExtAssetDir == "" {
        data, err = Asset("index.html")
    } else {
        var f *os.File
        f, err = os.Open(ExtAssetDir + "/index.html")
        data, err = ioutil.ReadAll(f)
    }

Which has the dependency to Asset package/function. How can I include that(Asset) dependency when building main.go. When I build main.go I get the following error

.\main.go:30:15: undefined: Asset

.\main.go:35:13: undefined: AssetInfo

That looks like go-bindata. It's a code generator. You'll have to download that tool and run it.

Your project probably has a go generate script, Makefile, or bash script to run the command. Otherwise, read the README for go-bindata to see how to generate your file correctly. It's supposed to create a go file that has your static files encoded into it.

Once you run it, it will generate your Asset function in a new file so you can compile.