* Package:    dev-ruby/rubygems-2.2.5-r1
 * Repository: gentoo
 * Maintainer: ruby@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux ruby_targets_ruby21 userland_GNU
 * FEATURES:   preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking rubygems-2.2.5.tgz to /var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/work/all
>>> Source unpacked in /var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/work
>>> Preparing source in /var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/work ...
 * Running prepare phase for all ...
 * Adjusting to prefix /
 *   operating_system.rb ...
 [ ok ]
 * Running source copy phase for ruby21 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/work ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/work ...
 * Running compile phase for ruby21 ...
>>> Source compiled.
>>> Test phase [not enabled]: dev-ruby/rubygems-2.2.5-r1

>>> Install rubygems-2.2.5-r1 into /var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/image/ category dev-ruby
 * Running install phase for ruby21 ...
 * ERROR: dev-ruby/rubygems-2.2.5-r1::gentoo failed (install phase):
 *   $RUBY is not set
 * 
 * Call stack:
 *     ebuild.sh, line  133:  Called src_install
 *   environment, line 4243:  Called ruby-ng_src_install
 *   environment, line 4049:  Called _ruby_each_implementation 'each_ruby_install'
 *   environment, line  398:  Called _ruby_invoke_environment 'ruby21' 'each_ruby_install'
 *   environment, line  497:  Called each_ruby_install
 *   environment, line  718:  Called doruby '-r' 'gauntlet_rubygems.rb' 'rubygems' 'rubygems.rb' 'ubygems.rb'
 *   environment, line  702:  Called die
 * The specific snippet of code:
 *       [[ -z ${RUBY} ]] && die "\$RUBY is not set";
 * 
 * If you need support, post the output of `emerge --info '=dev-ruby/rubygems-2.2.5-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-ruby/rubygems-2.2.5-r1::gentoo'`.
!!! When you file a bug report, please include the following information:
GENTOO_VM=  CLASSPATH="" JAVA_HOME=""
JAVACFLAGS="" COMPILER=""
and of course, the output of emerge --info =rubygems-2.2.5
 * The complete build log is located at '/var/log/portage/build/dev-ruby/rubygems-2.2.5-r1:20160921-135926.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/work/ruby21/rubygems-2.2.5/lib'
 * S: '/var/tmp/portage/dev-ruby/rubygems-2.2.5-r1/work/ruby21/rubygems-2.2.5'