I\'m using Eclipse 3.4 (Ganymede) with CDT 5 on Windows.
When the integrated spell checker doesn\'t know some word, it proposes (among others) the option to add the
Just a word of warning: If you follow the advice to replace the preference as above, it will affect spell checking if you also use Java. I think all I needed to do was change the "Select spelling engine to use" to the C++ engine (near the top of the preference setting on the preference page General->Editors->Text Editors->Spelling).