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

Calculating world dependencies /
!!! Problems have been detected with your world file
!!! Please run emaint --check world

... done!
[ebuild     U ] sys-devel/flex-2.5.33-r3 [2.5.4a-r5] USE="-nls% -static%" 
[ebuild     U ] app-arch/bzip2-1.0.4-r1 [1.0.2-r4] 
[ebuild     U ] media-libs/freetype-2.3.5-r2 [2.1.5-r1] USE="-X% -utils%" 
[ebuild     U ] sys-libs/libtermcap-compat-2.0.8-r2 [1.2.3-r1] 
[ebuild     U ] net-mail/mailbase-1 [0.00-r6] USE="-pam%" 
[ebuild     U ] mail-client/mailx-support-20060102-r1 [20030215] 
[ebuild     U ] sys-libs/cracklib-2.8.10 [2.7-r10] USE="-nls% -python%" 
[ebuild     U ] app-arch/gzip-1.3.12 [1.3.5-r5] 
[ebuild     U ] sys-apps/net-tools-1.60-r13 [1.60-r8] 
[ebuild     U ] sys-apps/kbd-1.13-r1 [1.08-r5] USE="-nls*" 
[ebuild  N    ] sys-apps/busybox-1.8.2  USE="-debug -make-symlinks -pam -savedconfig (-selinux) -static" 
[ebuild     U ] sys-apps/gawk-3.1.5-r5 [3.1.3-r2] 
[ebuild     U ] app-arch/tar-1.19-r1 [1.13.92-r3] 
[ebuild     U ] sys-apps/hdparm-7.7 [5.4] 
[ebuild     U ] sys-fs/reiserfsprogs-3.6.19-r2 [3.6.11] 
[ebuild     U ] app-arch/zip-2.32-r1 [2.3-r2] 
[ebuild  N    ] dev-libs/libxml2-2.6.30-r1  USE="-debug -doc -ipv6 -python -readline -test" 
[ebuild     U ] media-libs/libpng-1.2.22 [1.2.7] 
[ebuild     U ] dev-libs/libpcre-7.4 [5.0] USE="-doc% -unicode%" 
[ebuild     U ] sys-devel/bc-1.06-r6 [1.06-r5] USE="-readline* -static%" 
[ebuild     U ] sys-apps/xinetd-2.3.14 [2.3.12] USE="tcpd%* -perl%" 
[ebuild     U ] app-text/sablotron-1.0.1 [1.0] 
[ebuild     U ] net-misc/iputils-20070202 [020927] USE="-doc% -ipv6%" 
[ebuild     U ] sys-apps/less-416 [381] USE="-unicode%" 
[ebuild     U ] net-fs/samba-3.0.28 [3.0.2a-r2] USE="-ads% -async% -automount% -caps% -doc% -examples% -fam% -ipv6% -quotas% (-selinux) -swat% -syslog% -winbind%" LINGUAS="-ja% -pl%" 
[ebuild     U ] sys-libs/readline-5.2_p7 [4.3-r4] 
[ebuild  N    ] sys-libs/com_err-1.40.4  USE="-nls" 
[ebuild     U ] sys-devel/gettext-0.17 [0.12.1] USE="-acl% -doc% -emacs% -nls* -nocxx% -openmp%" 
[ebuild  N    ] virtual/editor-0  
[ebuild  N    ] sys-libs/ss-1.40.4  USE="-nls" 
[ebuild  NS   ] sys-libs/db-4.5.20_p2  USE="-bootstrap -doc -java -nocxx -tcl -test" 
[ebuild     U ] sys-fs/e2fsprogs-1.40.4 [1.35-r1] 
[ebuild     U ] sys-apps/util-linux-2.13-r2 [2.12i-r1] USE="-old-linux%" 
[ebuild     U ] net-irc/bitchx-1.1-r4 [1.1-r1] 
[ebuild     U ] net-ftp/glftpd-2.01 [1.32] 
[ebuild     U ] net-ftp/ftp-0.17-r6 [0.17-r3] USE="-ipv6%" 
[ebuild     U ] www-client/lynx-2.8.6-r2 [2.8.5] USE="-bzip2% -cjk% -unicode%" LINGUAS="-ja%" 
[ebuild     U ] net-misc/ntp-4.2.4_p4 [4.2.0-r2] USE="-caps% -ipv6% -openntpd% -zeroconf%" 
[ebuild     U ] mail-mta/postfix-2.4.5 [2.0.19] USE="mysql* -cdb% -dovecot-sasl% -hardened% -mailwrapper% -nis% (-selinux) -vda%" 
[ebuild     U ] sys-apps/file-4.21-r1 [4.06] USE="-python%" 
[ebuild  N    ] app-admin/eselect-1.0.10  USE="-bash-completion -doc -vim-syntax" 
[ebuild     U ] net-misc/wget-1.10.2 [1.9-r2] USE="-build% -ipv6* -nls*" 
[ebuild     U ] media-libs/jpeg-6b-r7 [6b-r4] 
[ebuild     U ] sys-apps/shadow-4.0.18.1-r1 [4.0.3-r9] USE="-cracklib% -nls* -nousuid% -pam* -skey%" 
[ebuild     U ] net-libs/liblockfile-1.06-r2 [1.03-r1] 
[ebuild  N    ] app-misc/screen-4.0.3  USE="-debug -multiuser -nethack -pam (-selinux)" 
[ebuild  N    ] net-libs/libpcap-0.9.8  USE="-ipv6" 
[ebuild     U ] net-libs/libwww-5.4.0-r7 [5.4.0-r2] USE="mysql*" 
[ebuild     U ] sys-process/psmisc-22.5-r2 [21.2-r4] USE="-X% -ipv6% -nls*" 
[ebuild     U ] sys-boot/grub-0.97-r3 [0.94-r1] USE="-custom-cflags% -netboot%" 
[ebuild     U ] net-misc/openssh-4.7_p1-r3 [3.9_p1-r1] USE="-X% -hpn% -libedit%" 
[ebuild     U ] media-libs/netpbm-10.40.0 [10.20] USE="xml%* -jbig% -jpeg2k% -rle%" 
[ebuild     U ] mail-client/mailx-8.1.2.20050715-r1 [8.1.2.20021129-r4] 
[ebuild     U ] net-im/naim-0.11.7.2 [0.11.6.4] 
[ebuild     U ] net-analyzer/nmap-4.50 [3.50-r1] USE="ssl%*" 
[ebuild     U ] media-gfx/imagemagick-6.3.5.10 [6.1.8.8] USE="xml%* -bzip2% -doc% -gs% -hdri% -jpeg2k% -nocxx% -openexr% -q32% -q8% -zlib%" 
[ebuild     U ] sys-libs/glibc-2.6.1 [2.3.4.20040808-r1] USE="-gd% -glibc-omitfp% -profile% (-selinux) -vanilla%" 
[ebuild  NS   ] dev-libs/glib-2.14.3  USE="-debug -doc -hardened" 
[ebuild     U ] app-admin/syslog-ng-2.0.6 [1.6.5-r2] USE="-hardened% -ipv6% (-selinux) -spoof-source%" 
[ebuild  N    ] media-libs/fontconfig-2.5.0-r1  USE="xml -doc" 
[ebuild  N    ] app-admin/eselect-fontconfig-1.0  
[ebuild     U ] sys-apps/debianutils-2.28.2 [1.16.7-r4] 
[ebuild  N    ] sys-apps/mktemp-1.5  
[ebuild     U ] sys-apps/baselayout-1.12.10-r5 [1.9.4-r6] USE="-unicode%" 
[ebuild  N    ] sys-apps/sysvinit-2.86-r10  USE="(-ibm) (-selinux) -static" 
[ebuild     U ] sys-apps/module-init-tools-3.4 [3.0] USE="-old-linux%" 
[ebuild  N    ] sys-fs/udev-115-r1  USE="(-selinux)" 
[ebuild  N    ] virtual/init-0  
[ebuild  NS   ] sys-kernel/gentoo-sources-2.6.23-r6  USE="-build -symlink" 
[blocks B     ] sys-apps/sysvinit (is blocking sys-apps/baselayout-1.9.4-r6)

!!! Error: The above package list contains packages which cannot be installed
!!!        at the same time on the same system.

For more information about Blocked Packages, please refer to the following
section of the Gentoo Linux x86 Handbook (architecture is irrelevant):

http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?full=1#blocked