emacsでpackage-installを利用する前に。

(require 'package) (add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t) (add-to-list 'package-archives '("melpa-stable" . "https://stable.melpa.org/packages/") t) (add-to-list 'package-archives '("marmalade" . "http://marmalade-repo.org/packages/") t) (add-to-list 'package-a…