emerge -upt gentoo-sources 

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

Calculating dependencies... done!
[ebuild  NS   ] sys-kernel/gentoo-sources-2.6.23-r6  USE="-build -symlink" 
[nomerge      ]  sys-fs/udev-115-r1  USE="(-selinux)" 
[nomerge      ]   sys-apps/baselayout-1.12.10-r5 [1.9.4-r6] USE="-unicode%" 
[ebuild     U ]    sys-apps/module-init-tools-3.4 [3.0] USE="-old-linux%" 
[ebuild  N    ]    virtual/init-0  
[ebuild  N    ]  sys-fs/udev-115-r1  USE="(-selinux)" 
[nomerge      ] virtual/init-0  
[ebuild  N    ]  sys-apps/sysvinit-2.86-r10  USE="(-ibm) (-selinux) -static" 
[nomerge      ] sys-apps/module-init-tools-3.4 [3.0] USE="-old-linux%" 
[ebuild     U ]  sys-apps/baselayout-1.12.10-r5 [1.9.4-r6] USE="-unicode%" 
[ebuild  N    ]   sys-apps/mktemp-1.5  
[ebuild     U ]    sys-apps/debianutils-2.28.2 [1.16.7-r4] 
[ebuild     U ]   sys-libs/readline-5.2_p7 [4.3-r4] 
[blocks B     ] sys-apps/sysvinit (is blocking sys-apps/baselayout-1.9.4-r6)