Analogically to these:
http://bugs.archlinux.org/index.php?do=details&id=1040&edit=yep
http://bugs.archlinux.org/index.php?do=details&id=1166

I'd like to ask for building qt with postgresql plugin support in the next release (non depending on postgresql package of course).New qt/kde database applications (I'm trying to build) really need it.It starts to be a standard way for accessing databases from qt/kde apps now.

The following is from the qt docs:

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How to build the plugin on Unix/Linux

Just installing the pq client library and the corresponding header files is not sufficient. You have to get the PostgreSQL source distribution and run the configure script. If you've already installed a binary distribution you don't need to build it. The source distribution is needed because the QPSQL7 plugin relies on a couple of
header files that are usually not a part of the binary distribution.

To make qmake find the PostgreSQL header files and shared
libraries, run qmake the following way (assuming that the
PostgreSQL sources can be found in /usr/src/psql):

cd $QTDIR/plugins/src/sqldrivers/psql
qmake -o Makefile "INCLUDEPATH+=/usr/src/psql/src/include /usr/src/psql/src/interfaces/libpq" "LIBS+=-L/usr/lib -lpq" psql.pro
make

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Other things like multibyte (utf) and locale support are already present in arch postgresql package because they are now a standard (you can't turn them off) in postgresql since version 7.3.something (I think). The above instructions should be enough to build the postgresql plugin support into qt.