localhost / # emerge --update --deep --newuse world
Calculating world dependencies... done!

!!! Error: the <sys-apps/dbus-0.91 package conflicts with another package;
!!!        the two packages cannot be installed on the same system together.
!!!        Please use 'emerge --pretend' to determine blockers.

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

localhost / # emerge bmpx
Calculating dependencies... done!

!!! Error: the <sys-apps/dbus-0.91 package conflicts with another package;
!!!        the two packages cannot be installed on the same system together.
!!!        Please use 'emerge --pretend' to determine blockers.

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

localhost / # emerge gnome
Calculating dependencies... done!

>>> Emerging (1 of 11) net-dns/libidn-0.5.15 to /
 * libidn-0.5.15.tar.gz MD5 ;-) ...                                       [ ok ]
 * libidn-0.5.15.tar.gz RMD160 ;-) ...                                    [ ok ]
 * libidn-0.5.15.tar.gz SHA1 ;-) ...                                      [ ok ]
 * libidn-0.5.15.tar.gz SHA256 ;-) ...                                    [ ok ]
 * libidn-0.5.15.tar.gz size ;-) ...                                      [ ok ]
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking libidn-0.5.15.tar.gz ;-) ...                                  [ ok ]

 * There was a problem determining which VM to use for generation-1
 * This is because the way Java is handled on Gentoo has drastically changed.
 * There does not seem to be a 1.4 or 1.3 JDK installed.
 * You should probably install =virtual/jdk-1.4* or =virtual/jdk-1.3*
 * It is important to have either a 1.4 or 1.3 JDK installed
 * in order for the old and new Java systems to coexist
 * Details about this can be found at:
 *      http://overlays.gentoo.org/proj/java/wiki/Why_We_Need_Java14

 * You should run, and follow the advice of:
 *      /usr/bin/java-check-environment
 * You will also likely want to follow the Java Upgrade Guide:
 *      http://www.gentoo.org/proj/en/java/java-upgrade.xml
 * If you have problems with the guide, please see:
 *      http://overlays.gentoo.org/proj/java/wiki/Common_Problems

!!! ERROR: net-dns/libidn-0.5.15 failed.
Call stack:

  ebuild.sh, line 1562:   Called dyn_setup
  ebuild.sh, line 665:   Called pkg_setup
  ebuild.sh, line 1255:   Called java-pkg_pkg_setup
  java-pkg.eclass, line 52:   Called die

!!! Expected VMHANDLE to be defined in the env
!!! If you need support, post the topmost build error, and the call stack if rel
evant.