Problem with QT for windows and namespaces

In a project being developed in QT Creator with ofx 0.9.1 i am scratching my head on how to handle the includes in libraries with namespaces.

For example, using ofxNetworkUtils, I get a lot of linking errors with Poco::* classes if I add the addon form the of.addons section in the QBS. At the same time, if I add the files manually, I get a lot of not found errors for the header files.

It has happened to me with other, more simple, libraries. Any recommendation on how to handle the includes in QT to avoid this behavious?