Oh, in this case it will make a difference.

Can you please set QTDIR, PATH and LD_LIBRARY_PATH as needed, then run "qmake -v". You should get something like the following:

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ben@grace:~/manual-source/arora/build> qmake -v
QMake version 2.01a
Using Qt version 4.6.1 in /opt/trunk-kde/qt/lib

Now that's weird.

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[warnec@chakra-desktop arora]$ echo $PATH
/opt/qt46/usr/bin:/opt/wine/bin:/bin:/usr/bin:/sbin:/usr/sbin:/opt/java/jre/bin:/usr/bin/perlbin/site:/usr/bin/perlbin/vendor:/usr/bin/perlbin/core
[warnec@chakra-desktop arora]$ echo $LD_LIBRARY_PATH
/opt/qt46/usr/lib
[warnec@chakra-desktop arora]$ qmake -v
QMake version 2.01a
Using Qt version 4.6.0 in /usr/lib
[warnec@chakra-desktop arora]$


How could it use qt 4.5 in /usr/lib, when I'm using 4.5.3 as my default installation?

When configuring Qt, did you pass the option "--prefix /opt/qt46/"?

When was I supposed to set that?

BTW, if you mean I should do that when building Qt from source, I must say that I didn't - I downloaded a pre-compiled package which was meant to be installed under /usr , but doing some magic in my package manager config file I set the root directory to /opt/qt46, so the files got copied in there.

This is the likely cause of the problem then, since the prefix is likely compiled into Qt.
Compiling Qt itself isn't difficult, and takes my system about 2 hours.