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I have just committed the multi-kdelibs/multi-qt/eclasses version 4 package.
This allows you to have multiple versions of kdelibs installed and so, for
example, use KDE3 (once it's released) together with KDE2 applications.
Everyone should upgrade at some point to >=x11-lib/qt-x11-2.3.1-r2 and
>=kde-base/kdelibs-2.2.1-r2. Or, you might emerge (or remerge) kde-base/kde
to automatically get the latest revisions of kde-base/* (this doesn't include
qt, you still have to upgrade it explicitly). There's no hurry though; you
can wait until you can dedicate a night or so to compiling.
1. Turn off KDE when emerging :-).
2a. If upgrading from kde-2.1.x or earlier, or from qt-2.2.x or earlier, you
must remerge all kde apps (not just kde-base/*) and unmerge their previous
2b. Otherwise, you only need to remerge x11-libs/qt-x11, kde-base/kdelibs and
3. Unmerge all previous revisions/versions that aren't multi-qt/multi-kde
compatible. Compatible versions are:
x11-libs/qt-x11: 2.3.1-r2, 2.3.2
Known issue: kdm doesn't display icons (the ones with the users' heads, black
on white). It may be fixable but I doubt it. It isn't important enough IMO
Developers and ebuild writers: if you want to write inheriting ebuilds for
kde/qt apps, read /usr/portage/eclass/doc/* very carefully and take a good
long look at existing ebuilds and eclasses. Make sure you understand the
changes in v4, see news.txt.
Gentoo Linux Developer, Desktop Team