See my answer to another question. You need a blank line after the // +build line.
Also, you probably want the ! in config.go, not in config.debug.go; and presumably you want one to be “DEBUG = false”.
See my answer to another question. You need a blank line after the // +build line.
Also, you probably want the ! in config.go, not in config.debug.go; and presumably you want one to be “DEBUG = false”.