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emerge -uDN world
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 * ERROR: kde-base/kdelibs-3.5.7-r3 failed.
 * Call stack:
 *   ebuild.sh, line 1654:   Called dyn_compile
 *   ebuild.sh, line 990:   Called qa_call 'src_compile'
 *   ebuild.sh, line 44:   Called src_compile
 *   kdelibs-3.5.7-r3.ebuild, line 153:   Called kde_src_compile
 *   kde.eclass, line 170:   Called kde_src_compile 'all'
 *   kde.eclass, line 340:   Called kde_src_compile 'myconf' 'configure' 'make'
 *   kde.eclass, line 322:   Called econf '--with-distribution=Gentoo' '--disable-fast-malloc' '--with-libart' '--with-libidn' '--with-ssl' '--without-hspell' '--disable-libfam' '--enable-dnotify' '--with-acl' '--with-alsa' '--without-arts' '--enable-cups' '--without-gssapi' '--with-tiff' '--without-jasper' '--without-openexr' '--without-utempter' '--without-lua' '--enable-sendfile' '--enable-mitshm' '--without-aspell' '--enable-dnssd' '--with-rgbfile=/usr/share/X11/rgb.txt' '--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 591:   Called die
 *
 * econf failed
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/kde-base/kdelibs-3.5.7-r3/temp/build.log'.

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emerge -uDN qt
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 *
 * ERROR: dev-lang/python-2.4.4-r5 failed.
 * Call stack:
 *   ebuild.sh, line 1654:   Called dyn_unpack
 *   ebuild.sh, line 768:   Called qa_call 'src_unpack'
 *   ebuild.sh, line 44:   Called src_unpack
 *   python-2.4.4-r5.ebuild, line 57:   Called unpack 'Python-2.4.4.tar.bz2' 'python-gentoo-patches-2.4.4-r3.tar.bz2'
 *   ebuild.sh, line 444:   Called die
 *
 * failure unpacking Python-2.4.4.tar.bz2