Thank you Sliawati for your quick reply, il will update to CDT 4.0.3.

Upon your question to remove the ActiveQt from the project include list do the following:
- Right click on the project directory in projects explorer or open "Project" menu and select "Properties".
- In the opened dialog select "C/C++ Include Paths and Symbols" at the left of the dialog.
- At the right you will have the list of includes just select the ActiveQt line and the "Remove" button.
After that the warning disapear on my Eclipse.
Regards
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Mica