'emerge kdelibs' fails with: ... 26000 files checked ... * This package will overwrite one or more files that may belong to other * packages (see list below). You can use a command such as `portageq * owners / <filename>` to identify the installed package that owns a ... * Detected file collision(s): * * /usr/share/dbus-1/system-services/org.kde.kcontrol.kcmremotewidgets.service * /usr/share/polkit-1/actions/org.kde.kcontrol.kcmremotewidgets.policy * /usr/lib64/kde4/libexec/kcmremotewidgetshelper * ... >>> Failed to install kde-base/kdelibs-4.4.5, Log file: Reproducible: Always root@condor:/usr/local/portage/sci-libs/gdal(95)# emerge --info Portage 2.1.9.4 (default/linux/amd64/10.0/desktop, gcc-4.4.4, glibc-2.12.1-r1, 2.6.35-gentoo-r5 x86_64) ================================================================= System uname: Linux-2.6.35-gentoo-r5-x86_64-Intel-R-_Core-TM-2_CPU_6600_@_2.40GHz-with-gentoo-2.0.1 Timestamp of tree: Sun, 12 Sep 2010 07:00:01 +0000 app-shells/bash: 4.1_p7 dev-java/java-config: 2.1.11 dev-lang/python: 2.6.5-r3, 3.1.2-r4 dev-util/cmake: 2.8.1-r2 sys-apps/baselayout: 2.0.1 sys-apps/openrc: 0.6.3 sys-apps/sandbox: 2.3-r1 sys-devel/autoconf: 2.13, 2.67 sys-devel/automake: 1.4_p6-r1, 1.7.9-r2, 1.8.5-r4, 1.9.6-r3, 1.10.3, 1.11.1 sys-devel/binutils: 2.20.1-r1 sys-devel/gcc: 4.4.4-r1 sys-devel/gcc-config: 1.4.1 sys-devel/libtool: 2.2.10 sys-devel/make: 3.81-r2 virtual/os-headers: 2.6.35 (sys-kernel/linux-headers) ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA PUEL dlj-1.1 skype-eula googleearth AdobeFlash-10.1 cadsoft" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=nocona -O2 -pipe -fomit-frame-pointer" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/X11/xkb /usr/share/config /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/eselect/postgresql /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5/ext-active/ /etc/php/cgi-php5/ext-active/ /etc/php/cli-php5/ext-active/ /etc/portage /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-march=nocona -O2 -pipe -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="assume-digests distlocks fixlafiles fixpackages news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch" FFLAGS="-march=nocona -O2 -pipe -fomit-frame-pointer" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_US.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="de fr" MAKEOPTS="-j1" PKGDIR="/usr/portage/packages/" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/var/lib/layman/dotnet /var/lib/layman/java-overlay /var/lib/layman/lordvan /var/lib/layman/science /var/lib/layman/x11 /var/lib/layman/sunrise /var/lib/layman/arcon /usr/local/portage /var/lib/cpan" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="64bit R X Xaw3d a52 aac abiword acl acpi admin afs alsa amd64 ao apache2 applet archive arpack asf aspell assistant audacious audiofile automap automount bash-completion beagle berkdb blas blast bluetooth boo boost branding bzip2 cairo cdda cddb cdf cdio cdparanoia cdr cg cgi chm cli consolekit corba cracklib crypt css cuda cups curl cxx daap db dbase dbi dbm dbus designer devhelp device-mapper dga dia djvu doc dri ds2490 ds9097 ds9097u dts dv dvb dvd dvdr dvi dynamicplugin eds elf emacs emboss empathy encode epiphany evo examples exif expat extensions extra extras fam fame ffmpeg fftw firefox fits flac fltk fontconfig foomaticdb fortran fpx fts3 fuse galago garmin gd gdal gdbm gedit geoip geolocation geos gif gimp ginac git glade glib gml gmp gmtsuppl gnokii gnome gnome-keyring gnome-print gnuplot gnutls gphoto2 gpm grammar graphics graphtft graphviz grass gs gsl gsm gstreamer gtk guile hal harness hddtemp hdf hdf5 hdri hlapi http httpd hvm iconv icq icu id3 ide imagemagick imap innodb inotify ipod ipv6 irda ithreads jabber jadetex java java5 java6 jbig john jpeg jpeg2k kdrive kerberos kpathsea kqemu kvm ladspa lame lapack latex latex3 lcms ldap lensfun libffi libgda libnotify libsamplerate lirc lm_sensors lua lzo mad mail maildir mailwrapper mapnik math matroska mikmod mkl mmx mmxext mng modules mono moonlight motif mozdevelop mozilla mp3 mp4 mpeg mpi mplayer mtp mudflap multilib musicbrainz mysql mysqli nautilus ncurses neXt netcdf netpbm network networking networkmanager nfs nls nntp nptl nptlonly nsplugin ntfs ntp numarray numeric nvidia obex objc ocaml octave odbc ogdi ogg ole openexr opengl openmp overview pae pam pango pcre pda pdf perl plotutils plugins png podcast policykit posix postgres postscript ppds pppd preview-latex proj projectx pstricks pulseaudio pymol python python-bindings qemu qhull qt3support qt4 quicktime readline reflection reiserfs rle romio rpc rrdcgi rrdtool samba sasl science sdl secure-delete semantic-desktop server session sip slang slp smbclient smp sms sndfile snmp soup sox speex spell sql sqlite sse sse2 ssl startup-notification stlport subtitles subversion suexec svg swig sysfs szip t1lib tcl tcpd tex tex4ht texmacs theora threads thunderbird tidy tiff tk tntc tools truetype udev unicode usb userlocales utempter v4l2 video virtualbox vorbis wav webdav webdav-serf webkit wmf wxwidgets x264 xattr xcb xemacs xext xine xml xmlreader xmlrpc xorg xpm xulrunner xv xvid xvmc zlib zvbi" ALSA_CARDS="intel8x0" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif so speling status unique_id userdir usertrack vhost_alias" CAMERAS="canon" DVB_CARDS="tda10045 tda10046lifeview" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev " KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="de fr" NETBEANS_MODULES="apisupport cnd dlight enterprise ergonomics groovy gsf harness ide identity j2ee java mobility nb php profiler ruby websvccommon xml" QEMU_SOFTMMU_TARGETS="i386 ppc ppc64 x86_64" QEMU_USER_TARGETS="arm i386 x86_64" RUBY_TARGETS="ruby18 jruby" USERLAND="GNU" VIDEO_CARDS="nv nvidia nouveau vesa" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
The Gentoo KDE team does no work and therefore makes no assurances regarding KDE downgrades. If you really want to downgrade from 4.5.1 to 4.4.5, you'll have to do the work. From this bug you should start by removing plasma-runtime-4.5.1.
Actually the downgrade issue was our problem while messing with the package.mask files in profile, please sync again, portage shouldn't try to downgrade kde. Sorry for the mess