How do I... Enable FCKeditor's built-in spell-checker?

Install aspell

To enable spell check, first be sure you have installed aspell as well as your language's dictionary:

apt-get install aspell
apt-get install aspell-en

Enable FCKeditor spellcheck plugin

Go to the control panel and in the "Customize" > "Editor Configuration" screen, add these values:

FCKConfig.ToolbarSets["Default"] = [
    ['MindTouchDeki_Save','-','Source'],
    ['RemoveFormat','-','TextColor','BGColor'],
    ['MindTouchDeki_InsertExtension','-','MindTouchDeki_Transform'],
    '/',
    ['MindTouchDeki_Cancel'],
    ['Bold','Italic','Underline','StrikeThrough','-','OrderedList','UnorderedList','JustifyLeft','JustifyCenter','JustifyRight','JustifyFull','-','Outdent','Indent','Blockquote'],
    ['MindTouchDeki_InsertLink','MindTouchDeki_InsertImage','MindTouchDeki_InsertVideo','MindTouchDeki_InsertTemplate','Table'],
    '/',
    ['Style','FontFormat','FontName','FontSize','SpellCheck']
] ;

FCKConfig.SpellChecker = 'SpellerPages' ;

Configure FCKeditor to use the correct aspell

By default, FCKeditor attepts to load the Window's path to aspell. Go into {WEB_ROOT}/fckeditor/core/editor/dialog/fck_spellerpages/spellerpages/server-scripts/spellchecker.php and make sure the current aspell_prog is defined:

//$aspell_prog    = '"C:\Program Files\Aspell\bin\aspell.exe"';    // by FredCK (for Windows)
$aspell_prog    = 'aspell';        

Use spell check!

Load the editor, and click your "Spell check" button! FCKeditor's spell check requires a full document pass before change are applied, so be sure you go through the whole document - you cannot spell check half the document and apply those changes.