Arjun, http://mail.kde.org/pipermail/kde-frameworks-devel/2015-February/022157.html <-- it seems your recent commit changed Dolphin to require Qt 5.4 since AssumeLocalFile is new in Qt 5.4. If you want to depend on Qt 5.4 please bump the requirement in the kde-baseapps/CMakeLists.txt. If we/you want it to build with Qt 5.3 some other workaround is needed.
thanks, Jeremy
