>>> Unpacking source...
* Home for VM 'sun-jdk-1.6' does not exist: /usr/lib/jvm/sun-jdk-1.6/
* Invalid value for GENTOO_VM: sun-jdk-1.6
 *
 * ERROR: dev-java/icu4j-3.6.1-r1 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_unpack
 *             environment, line 3996:  Called die
 * The specific snippet of code:
 *       jar -xf "${DISTDIR}/${PN}src_${MY_PV}.jar" || die "Failed to unpack";
 *  The die message:
 *   Failed to unpack
 *
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/dev-java/icu4j-3.6.1-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-java/icu4j-3.6.1-r1/temp/environment'.
 *
!!! When you file a bug report, please include the following information:
GENTOO_VM=sun-jdk-1.6  CLASSPATH="" JAVA_HOME="/opt/sun-jdk-1.6.0.02"
JAVACFLAGS="-source 1.4 -target 1.4" COMPILER=""
and of course, the output of emerge --info

 * Messages for package dev-java/icu4j-3.6.1-r1:

 *
 * ERROR: dev-java/icu4j-3.6.1-r1 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_unpack
 *             environment, line 3996:  Called die
 * The specific snippet of code:
 *       jar -xf "${DISTDIR}/${PN}src_${MY_PV}.jar" || die "Failed to unpack";
 *  The die message:
 *   Failed to unpack
 *
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/dev-java/icu4j-3.6.1-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-java/icu4j-3.6.1-r1/temp/environment'.
 *
 * GNU info directory index is up-to-date.
 * IMPORTANT: 9 config files in '/etc' need updating.
 * See the CONFIGURATION FILES section of the emerge
 * man page to learn how to update config files.