passing in values during go build time

README.md

 package main

 import "fmt"
  
   var (
     version  = "develop"
     otherval = "unset"
   )
   
 func main() {
     fmt.Println(version)
     fmt.Println(otherval)
 }

go build -ldflags="-X main.version=$123 -X main.otherval=abc"