KeePassX is on hiatus as the project moves toward the 2.0 rewrite. In the meantime, pre-compiled packages are becoming difficult to locate. This is not a major issue, as the src files are available for source forge. One hurdle I encountered is that the INSTALL instructions that accompany the latest src files are a little inaccurate for Fedora.
In order to install KeePassX (0.4.3) on Fedora (I am using 14), perform the following:
tar xzf keepassx-0.4.3.tar.gz
sudo yum install qt-devel qt-config
cd keepassx-0.4.3 qmake-qt4 sudo yum install gcc gcc-c++ libXmu-devel libXtst-devel make sudo make install
There you have it, KeePassX 0.4.3 on Fedora 14.