Embed file in Go using go link flag

main.go

package main

import (
	"encoding/base64"
	"fmt"
)

var myfile string

func main() {
	contents, _ := base64.StdEncoding.DecodeString(myfile)
	fmt.Println(string(contents))
}

Makefile

b64contents = $(shell base64 -w 0 myfile)
build:
	go build -ldflags "-X main.myfile=$(b64contents)"