configure -platform win32-g++ -xplatform symbian-sbsv2
qmake
sbs -c armv5_udeb [-e -j etc]

FAILED link for armv5_udeb: epoc32\release\armv5\udeb\capabilities.exe.sym
mmp: examples\phonon\capabilities\capabilities_0xA000CF69.mmp
Error: L6218E: Undefined symbol vtable for Phonon::ObjectDescriptionModel<(Phonon::ObjectDescriptionType)0> (referred from window.o).
Not enough information to list image symbols.
Finished: 1 information, 0 warning and 1 error messages.

Seems related to that templated class using function exports instead of exporting the whole class.
Tested on S60 5.0 public SDK