Requirements

For installing KPackage you need:

Qt™ 4 and KDE 4
SMART package manager

For listing Debian packages no other software is needed but to install and uninstall the packages you need:

the dpkg package manager or
apt-get and apt-cache

For BSD packages you need the package management programs:

pkg_info
pkg_add
pkg_delete

For Slackware packages you need:

installpkg
removepkg

For dealing with Redhat packages you need:

rpm

For KPackage to work correctly with RPM packages the RPM database must be initialized. If typing rpm -qa gives an error about unable to open.... then try rpm --rebuilddb.