At last I got success in building KDE >4.2 from SVN trunk. Learnt a lot, and many confusions were cleared. The instructions at http://techbase.kde.org/Getting_Started/Build/Unstable_Version were very helpful. Had some problems because recently the Qt version used was upgraded to 4.5 RC, so i had to clear my build directories. And , lots of thanks to the #kde IRC channel, was very helpful, and again, to the wonderful documentation at the kde techbase. Trying to work on a minor bug in a plasmoid, but unsuccessful in running its svn version. Lets see what happens …