QtWebEngine build not skipped if required dependencies are missing

When I build Qt 5.4 without further parameters, Qt Script is not being built. There is no libQt5Script.so* in qtbase/lib. In Qt 5.3.2 it was being built by default.

My command line is:

./configure -developer-build -opensource -nomake examples -nomake tests -confirm-license && make -j8

It does not seem to make a difference whether I build in-source or out-of-source.