Hi! Current ~amd64 tree says - see below. My steps?
------------------------------------------------------- emerge -pvDuN world These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild U ] net-firewall/iptables-1.4.3.1 [1.4.2-r2] USE="(-l7filter%)" 422 kB [ebuild U ] x11-libs/pixman-0.14.0-r1 [0.14.0] USE="mmx sse2 (-altivec) -debug (-sse%*)" 0 kB [ebuild R ] dev-cpp/gtkmm-2.14.3 USE="-debug -doc -examples -test (-accessibility%*)" 0 kB [ebuild R ] media-video/mplayer-1.0_rc2_p20090322 USE="X a52 aac aalib alsa amrnb amrwb ass cddb cdio cdparanoia dirac dts dv dvb dvd dvdnav enca encode faac faad gif iconv jack jpeg ladspa lirc live mad mmx mp2 mp3 nemesi network opengl oss png pulseaudio quicktime rar real rtc schroedinger sdl speex sse sse2 ssse3 theora tremor truetype unicode vorbis x264 xscreensaver xv xvid -3dnow -3dnowext (-altivec) -arts -bidi - bindist -bl -cpudetection -custom-cflags -custom-cpuopts -debug -dga -directfb -doc -dxr3 -esd -fbcon -ftp - ggi -gtk -ipv6 -joystick -libcaca -lzo -md5sum -mmxext -mng -musepack -nas -openal -pnm -pvr -radio -samba (- svga) -teletext -tga -v4l -v4l2 -vdpau (-vidix) (-win32codecs) -xanim -xinerama -xvmc* -zoran" VIDEO_CARDS="- mga -nvidia -s3virge -tdfx -vesa" 0 kB Total: 4 packages (2 upgrades, 2 reinstalls), Size of downloads: 422 kB !!! Multiple package instances within a single package slot have been pulled !!! into the dependency graph, resulting in a slot conflict: dev-cpp/gtkmm:2.4 ('ebuild', '/', 'dev-cpp/gtkmm-2.14.3', 'merge') pulled in by dev-cpp/gtkmm:2.4 required by world >=dev-cpp/gtkmm-2.4 required by ('installed', '/', 'dev-cpp/gconfmm-2.24.0', 'nomerge') >=dev-cpp/gtkmm-2.10.0 required by ('installed', '/', 'media-gfx/inkscape-0.46-r5', 'nomerge') (and 9 more) ('installed', '/', 'dev-cpp/gtkmm-2.14.3', 'nomerge') pulled in by >=dev-cpp/gtkmm-2.12.3[accessibility] required by ('installed', '/', 'media-sound/ardour-2.7.1', 'nomerge') (and 12 more) Explanation: New USE for 'dev-cpp/gtkmm:2.4' are incorrectly set. In order to solve this, adjust USE to satisfy '>=dev-cpp/gtkmm-2.12.3[accessibility]'.