qt

i have to many qt's installed qt3-mysql-3.1.2-5 qt3-unixODBC-3.1.2-5 yast2-ui-qt-2.3.14-1 qt-2.3.2-34 qt-devel-2.3.2-34 qt3-extensions-3.1.2-5 qt3-non-mt-3.1.2-3 qt3-3.1.2-4 qtopia-free-1.5.0-1 qt3-devel-tools-3.1.2-5 qt3-man-3.1.2-5 qtopia-desktop-1.6.0-1 qt3-devel-3.1.2-4 how do i know which is latest? can i remove the rest whichone should be in etc/ld.so.conf