You probably need to enable rpmforge-extras as well as rpmforge.
I was just testing the sogo-2.0 nightly rpms and as long as you don't have samba or samba3x installed, it should work like this. As you can see sogo's samba4 rpm has file conflicts with centos's samba3x rpm so it did not work for me (I need to keep samba3x for other applications)
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
Installing:
samba4 i386 4.0.0-1.alpha17.el5.5 sogo-nightly-rhel5 35 M
sogo i386 2.0_20111022-1.el5 sogo-nightly-rhel5 2.6 M
sogo-openchange-backend
i386 2.0_20111022-1.el5 sogo-nightly-rhel5 193 k
sogo-tool i386 2.0_20111022-1.el5 sogo-nightly-rhel5 32 k
sope49-gdl1-mysql i386 4.9-20111022_1664.el5.1 sogo-nightly-rhel5 32 k
Installing for dependencies:
gnustep-base i386 1.23.0-1 sogo-nightly-rhel5 1.7 M
gnustep-make i386 2.6.1-1 sogo-nightly-rhel5 202 k
libevent i386 1.4.13-1 base 112 k
libffi i386 3.0.10-1 sogo-nightly-rhel5 15 k
libmemcached i386 0.34-1 sogo-nightly-rhel5 113 k
libobjc i386 4.1.2-51.el5 base 104 k
memcached i386 1.4.7-1.el5.rfx rpmforge-extras 79 k
perl-AnyEvent i386 5.340-1.el5.rfx rpmforge-extras 360 k
perl-Async-Interrupt i386 1.05-1.el5.rf rpmforge 74 k
perl-EV i386 4.03-1.el5.rf rpmforge 367 k
perl-Guard i386 1.021-1.el5.rf rpmforge 39 k
perl-JSON noarch 2.50-1.el5.rf rpmforge 100 k
perl-JSON-XS i386 2.30-1.el5.rf rpmforge 150 k
perl-Parse-Yapp noarch 1.05-1.el5.rf rpmforge 46 k
perl-TermReadKey i386 2.30-3.el5.rf rpmforge 55 k
perl-YAML noarch 0.72-1.el5.rf rpmforge 84 k
perl-common-sense i386 3.0-1.el5.rf rpmforge 22 k
sope49-appserver i386 4.9-20111022_1664.el5.1 sogo-nightly-rhel5 908 k
sope49-cards i386 2.0_20111022-1.el5 sogo-nightly-rhel5 153 k
sope49-core i386 4.9-20111022_1664.el5.1 sogo-nightly-rhel5 328 k
sope49-gdl1 i386 4.9-20111022_1664.el5.1 sogo-nightly-rhel5 159 k
sope49-gdl1-contentstore
i386 2.0_20111022-1.el5 sogo-nightly-rhel5 55 k
sope49-ldap i386 4.9-20111022_1664.el5.1 sogo-nightly-rhel5 46 k
sope49-mime i386 4.9-20111022_1664.el5.1 sogo-nightly-rhel5 276 k
sope49-sbjson i386 2.3.1-20111022_1664.el5.1 sogo-nightly-rhel5 16 k
sope49-xml i386 4.9-20111022_1664.el5.1 sogo-nightly-rhel5 207 k
Updating for dependencies:
perl-Net-SSLeay i386 1.36-1.el5.rfx rpmforge-extras 316 k
Transaction Summary
Install 31 Package(s)
Upgrade 1 Package(s)
Total download size: 44 M
Is this ok [y/N]: y
....
Transaction Check Error:
file /usr/lib/libtdb.so.1 from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package libtdb-1.2.1-6.el5.i386
file /usr/lib/libtalloc.so.2 from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package libtalloc-2.0.1-11.el5.i386
file /usr/bin/tdbbackup from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package tdb-tools-1.2.1-6.el5.i386
file /usr/bin/tdbdump from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package tdb-tools-1.2.1-6.el5.i386
file /usr/bin/tdbtool from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package tdb-tools-1.2.1-6.el5.i386
file /usr/share/man/man8/tdbbackup.8.gz from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package tdb-tools-1.2.1-6.el5.i386
file /usr/share/man/man8/tdbdump.8.gz from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package tdb-tools-1.2.1-6.el5.i386
file /usr/share/man/man8/tdbtool.8.gz from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package tdb-tools-1.2.1-6.el5.i386
file /usr/bin/net from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/bin/pdbedit from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/bin/profiles from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbcontrol from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbcquotas from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbpasswd from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/bin/testparm from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/lib/libnetapi.so.0 from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-common-3.5.4-0.83.el5_7.2.i386
file /usr/bin/ntlm_auth from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-winbind-3.5.4-0.83.el5_7.2.i386
file /usr/bin/wbinfo from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-winbind-3.5.4-0.83.el5_7.2.i386
file /usr/lib/libwbclient.so.0 from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-winbind-3.5.4-0.83.el5_7.2.i386
file /usr/sbin/winbindd from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-winbind-3.5.4-0.83.el5_7.2.i386
file /usr/share/man/man1/ntlm_auth.1.gz from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-winbind-3.5.4-0.83.el5_7.2.i386
file /usr/bin/eventlogadm from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbstatus from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-3.5.4-0.83.el5_7.2.i386
file /usr/sbin/nmbd from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-3.5.4-0.83.el5_7.2.i386
file /usr/sbin/smbd from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-3.5.4-0.83.el5_7.2.i386
file /usr/bin/nmblookup from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/bin/rpcclient from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/bin/sharesec from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbcacls from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbclient from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbget from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbspool from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/bin/smbtree from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386
file /usr/share/man/man1/nmblookup.1.gz from install of samba4-4.0.0-1.alpha17.el5.5.i386 conflicts with file from package samba3x-client-3.5.4-0.83.el5_7.2.i386 |