I think the problem is the requirements of keepassX for linux, maybe the best solution will be the release of a newer QT version for maemo diablo.

Minimum requirements for KeePassX v0.3.1 and higher:
Build Dependencies
* Qt library >= 4.3
(required modules: QtCore, QtGui, QtXml)
* libXtst
Application bundle
* X11 with XRandR, Xinerama and XTest extentions
* GLibC 2.4