It's simple. Really simple. Use the dynamically linked version of Opera (not the statically built one). Before executing the Opera binary just set the QT_XFT environment variable. Done. Really!
$ export QT_XFT=1 $ operaYou might want to put the first command in your shell startup script (~/.bashrc) And I believe that setting QT_XFT would enable font-antialiasing in all Qt applications.
Note: For this to work, yout Qt library should've been compiled with xft support (and that is most probable with distro's nowadays. At least I can vouch for RedHat 7.2)
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