Tim, All,
I have built and tested (to a fair extent) Qt3-3.5.0 in tde 3.5.13-sru. It has worked without issue so for. Good deal :)
-- David C. Rankin, J.D.,P.E.
Be careful with this though; 3.5.0 introduces significant style API changes and even if TDE compiles against it, the TDE styles may not function correctly without the changes to various TDE modules that went into R14.
Tim