If you did install kdelibs, then the Qt version that is picked up by
this configure is not the same version you used to compile kdelibs.
The Qt Plugin installed by kdelibs is *ONLY* loadable if it is the
_same Qt version_, compiled with the _same compiler_ and the same Qt
configuration settings.
!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/kdebase-3.5.2-r2/work/kdebase-3.5.2/config.log
!!! ERROR: kde-base/kdebase-3.5.2-r2 failed.
Call stack:
ebuild.sh, line 1539: Called dyn_compile
ebuild.sh, line 939: Called src_compile
kdebase-3.5.2-r2.ebuild, line 129: Called kde_src_compile
kde.eclass, line 166: Called kde_src_compile 'all'
kde.eclass, line 325: Called kde_src_compile 'myconf' 'configure' 'make'
kde.eclass, line 307: Called econf '--with-dpms' '--without-arts' '--without-ldap' '--with-gl' '--with-ssl' '--without-samba' '--without-openexr' '--without-sensors' '--without-libusb' '--without-libraw1394' '--without-hal' '--disable-dnssd' '--without-composite' '--without-xscreensaver' '--without-xinerama' '--with-usbids=/usr/share/misc/usb.ids' '--with-pam=yes' '--without-java' '--with-x' '--enable-mitshm' '--without-xinerama' '--with-qt-dir=/usr/qt/3' '--enable-mt' '--with-qt-libraries=/usr/qt/3/lib' '--disable-dependency-tracking' '--disable-debug' '--without-debug' '--disable-final' '--without-arts' '--prefix=/usr/kde/3.5' '--mandir=/usr/kde/3.5/share/man' '--infodir=/usr/kde/3.5/share/info' '--datadir=/usr/kde/3.5/share' '--sysconfdir=/usr/kde/3.5/etc'
ebuild.sh, line 541: Called die
!!! econf failed
!!! If you need support, post the topmost build error, and the call stack if relevant.