Code Navigation does not work for headers under /epoc32/include/*

I don't know how includes are fed to the code browser/indexer exactly in Creator, but for includes under the <SDK Root>/include/ the navigation is fine when I F2 on a header.

If the header exists under /epoc32/include/* (anywhere recursively) the it wont' work but the build will succeed. So what am I doing wrong to tell Creator where to look for headers?

Is it only the include specified in .qmake.cache, e.g. QMAKE_INCDIR_QT = $$QT_BUILD_TREE
include ?