}
	if n >= 1 && (knownOS[l[n-1]] || knownArch[l[n-1]]) {
		return ctxt.matchTag(l[n-1], allTags)
	}
	return true
}

// ToolDir is the directory containing build tools.
var ToolDir = getToolDir()

// IsLocalImport reports whether the import path is
// a local import path, like ".", "..", "./foo", or "../foo".
func IsLocalImport(path string) bool {
	return path == "." || path == ".." ||