checking for Qt... configure: error: Qt (>= Qt 3.3 and < 4.0) (headers and libraries) not found. Please check your installation!
For more details about this problem, look at the end of config.log.

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/kde-base/kdebase-kioslaves-3.5.5-r1/work/kdebase-kioslaves-3.5.5/config.log

!!! ERROR: kde-base/kdebase-kioslaves-3.5.5-r1 failed.
Call stack:
  ebuild.sh, line 1568:   Called dyn_compile
  ebuild.sh, line 937:   Called src_compile
  kdebase-kioslaves-3.5.5-r1.ebuild, line 48:   Called kde-meta_src_compile
  kde-meta.eclass, line 379:   Called kde_src_compile
  kde.eclass, line 171:   Called kde_src_compile 'all'
  kde.eclass, line 338:   Called kde_src_compile 'myconf' 'configure' 'make'
  kde.eclass, line 320:   Called econf '--without-ldap' '--without-samba' '--with-hal' '--without-openexr' '--without-java' '--with-x' '--enable-mitshm' '--without-xinerama' '--with-qt-dir=/opt/qt' '--enable-mt' '--with-qt-libraries=/opt/qt/lib' '--disable-dependency-tracking' '--disable-debug' '--without-debug' '--disable-final' '--with-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 540:   Called die

!!! econf failed
!!! If you need support, post the topmost build error, and the call stack if relevant.