>>> Emerging (3 of 29) dev-java/libreadline-java-0.8.0-r1 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> checking libreadline-java-0.8.0-src.tar.gz ;-)
 * There was a problem determining which VM to use for generation-1
 * You may need to set your generation-1 VM again, and run env-update && source/etc/profile
 * Also, make sure you have followed the Java Upgrade Guide:
 * http://www.gentoo.org/proj/en/java/java-upgrade.xml                                                                                                 [ !! ]

!!! ERROR: dev-java/libreadline-java-0.8.0-r1 failed.
Call stack:
  ebuild.sh, line 1555:   Called dyn_setup
  ebuild.sh, line 668:   Called pkg_setup
  ebuild.sh, line 1248:   Called java-pkg_pkg_setup
  java-pkg.eclass, line 51:   Called die

!!! Expected VMHANDLE to be defined in the env, but it wasn't
!!! If you need support, post the topmost build error, and the call stack if relevant.