is a variable defined in `
Its value is
Non-nil if Auto-Compression mode is enabled.
See the command `auto-compression-mode' for a description of this minor mode.
Setting this variable directly does not take effect;
either customize it (see the info node `Easy Customization')
or call the function `auto-compression-mode'.
You can customize this variable.
This variable was introduced, or its default value was changed, in
version 22.1 of Emacs.