Bugzilla Bug 138199

bridge-utils-1.0.6-r3 has a dependency on autoconf-2.5*.

Since 2.60 and 2.59 occupy the same SLOT, if this package is installed, portage
will want to downgrade autoconf.

I have the same problem.

sirpreis sirpreis # emerge -atvuDN world

These are the packages that would be merged, in reverse order:

Calculating world dependencies... done!
[nomerge      ] net-misc/bridge-utils-1.0.6-r3  USE="-sysfs" 
[ebuild     UD]  sys-devel/autoconf-2.59-r7 [2.59d] USE="emacs" 903 kB 
....
[ebuild     U ] sys-devel/autoconf-wrapper-3.2-r2 [3.2-r1] 0 kB 
[nomerge      ]  sys-devel/autoconf-2.13  
[ebuild     U ]            sys-devel/autoconf-2.60 [2.59d] USE="emacs" 1,334 kB 
[ebuild     U ]        sys-devel/binutils-2.17 [2.16.1-r2] USE="nls -multislot
-multitarget -test -vanilla" 13,482 kB 
[nomerge      ]    sys-libs/readline-5.1_p4  
[nomerge      ]     app-shells/bash-3.1_p17  USE="nls -afs -bashlogger -build" 
[ebuild     U ]      sys-libs/ncurses-5.5-r3 [5.5-r2] USE="gpm unicode
-bootstrap -build -debug -doc -minimal -nocxx -trace%" 2,259 kB 

Total size of downloads: 39,010 kB
Portage overlays:
 [1] /usr/local/overlays/local

Would you like to merge these packages? [Yes/No]

------------------------------------------------

sirpreis sirpreis # emerge --info 
Portage 2.1.1_pre1-r4 (default-linux/x86/2006.0, gcc-4.1.1/vanilla,
glibc-2.4-r3, 2.6.17-gentoo i686)
=================================================================
System uname: 2.6.17-gentoo i686 Intel(R) Pentium(R) 4 CPU 2.60GHz
Gentoo Base System version 1.12.1
ccache version 2.4 [enabled]
dev-lang/python:     2.4.3-r1
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     2.4-r2
dev-util/confcache:  [Not Present]
sys-apps/sandbox:    1.2.18.1
sys-devel/autoconf:  2.13, 2.59d
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2
sys-devel/binutils:  2.16.1-r2
sys-devel/gcc-config: [Not Present]
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r5
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=pentium4 -pipe -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/lib/mozilla/defaults/pref /usr/share/X11/xkb
/usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/eselect/compiler /etc/gconf
/etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c"
CXXFLAGS="-O2 -march=pentium4 -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig ccache distlocks metadata-transfer parallel-fetch sandbox
sfperms strict"
GENTOO_MIRRORS="ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo
http://linux.rz.ruhr-uni-bochum.de/download/gentoo-mirror/
http://ftp.uni-erlangen.de/pub/mirrors/gentoo
ftp://ftp.join.uni-muenster.de/pub/linux/distributions/gentoo
ftp://ftp.wh2.tu-dresden.de/pub/mirrors/gentoo
ftp://ftp6.uni-muenster.de/pub/linux/distributions/gentoo
http://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/"
LC_ALL="en_US.utf8"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --delete-after --stats --timeout=180
--exclude='/distfiles' --exclude='/local' --exclude='/packages'"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/overlays/local"
SYNC="rsync://rsync.de.gentoo.org/gentoo-portage"
USE="x86 X aac aim alsa apm asf avi berkdb bitmap-fonts cairo cdr cli crypt dri
dvd eds emacs emboss encode esd firefox foomaticdb fortran gdbm gif glitz gnome
gpm gstreamer gtk gtk2 imlib ipv6 isdnlog java jpeg libg++ libwww mad mikmod
motif mp3 mpeg ncurses nls nptl nptlonly nsplugin ogg opengl oss pam pcre
pdflib perl png pppd python qt quicktime readline real reflection sdl session
spell spl ssl svg tcpd tetex truetype truetype-fonts type1-fonts udev unicode
vorbis win32codecs xml xorg xv zlib elibc_glibc input_devices_keyboard
input_devices_mouse kernel_linux userland_GNU video_cards_radeon"
Unset:  CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LDFLAGS, LINGUAS,
PORTAGE_RSYNC_EXTRA_OPTS

*** Bug 138503 has been marked as a duplicate of this bug. ***

fixed in cvs.