After 2 days of hard-compiling, i had the same question. I'd tried an easy experiment, just mv /usr/kde/3 /usr/kde/anything. I started kde.3.0.4 and did'nt work (ok). I started kde.3.1 and worked (ok). So i did rm -rf /usr/kde/anything And kde.3.1 works fine. You can free at least 260MB removing /usr/kde/3. This works in my box, because i had kde.3.0.4 build from binaris, and i did emerge -u kde, so it replaced the "registry" (i suppose) but not removed the binarys. good luck
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