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9.2 How do I perform spell checks?

Emacs has support for spell checking on demand (ispell) and as your type (flyspell). Both packages depend on a copy of ispell 3.2 or a compatible spell-checking program. GNU Aspell is a popular choice these days, outdated Windows installers are available from the official site. Another possibility is Hunspell, which is available from the ezwinports site. If you’re using the MSYS2 distribution, you can install a recent version of either GNU Aspell or Hunspell through the package manager Pacman. See Other useful ports.

Once installed, you will need to configure ispell-program-name to tell ispell and flyspell to use aspell or hunspell as a replacement for ispell. You can include the full path to the aspell/hunspell binary, which means you do not need to add its installation directory to the PATH.