However, there’s an official QT4 build indeed.
When downloading Opera,
click cancel and change “qt3” in the URL to “qt4”,
or in general you may browse the directory where the file lays on, in order to get compressed files instead of packages.
For example,
Opera 10.10 for debian/Ubuntu builds in QT4 (AMD64):
http://snapshot.opera.com/unix/rc-4742/x86_64-linux/opera_10.10.4742.gcc4.qt4_amd64.deb
The directory:
http://snapshot.opera.com/unix/rc-4742/
