* Package:    dev-ruby/rdoc-4.2.0
 * Repository: gentoo
 * Maintainer: ruby@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux ruby_targets_ruby21 ruby_targets_ruby22 userland_GNU
 * FEATURES:   preserve-libs sandbox userpriv usersandbox
 * Running unpack phase for all ...
 * Unpacking .gem file... ...
 [ ok ]
 * Uncompressing metadata ...
 [ ok ]
 * Unpacking data.tar.gz ...
 [ ok ]
 * Running prepare phase for all ...
 * Applying rdoc-3.0.1-bin-require.patch ...
 [ ok ]
 * Running source copy phase for ruby21 ...
 * Running source copy phase for ruby22 ...
 * Running compile phase for ruby21 ...
 * Running compile phase for ruby22 ...
 * Running compile phase for all ...
 * Running install phase for ruby21 ...
 * Running install phase for ruby22 ...
 * Running install phase for all ...
 * ERROR: dev-ruby/rdoc-4.2.0::gentoo failed (install phase):
 *   USE Flag 'ruby_targets_ruby20' not in IUSE for dev-ruby/rdoc-4.2.0
 * 
 * Call stack:
 *          ebuild.sh, line  115:  Called src_install
 *        environment, line 4446:  Called ruby-ng_src_install
 *        environment, line 4146:  Called _ruby_invoke_environment 'all' 'all_ruby_install'
 *        environment, line  566:  Called all_ruby_install
 *        environment, line  662:  Called use 'ruby_targets_ruby20'
 *   phase-helpers.sh, line  200:  Called die
 * The specific snippet of code:
 *   				die "USE Flag '${u}' not in IUSE for ${CATEGORY}/${PF}"
 * 
 * If you need support, post the output of `emerge --info '=dev-ruby/rdoc-4.2.0::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-ruby/rdoc-4.2.0::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 =rdoc-4.2.0
 * The complete build log is located at '/var/tmp/portage/dev-ruby/rdoc-4.2.0/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-ruby/rdoc-4.2.0/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-ruby/rdoc-4.2.0/work/all/rdoc-4.2.0'
 * S: '/var/tmp/portage/dev-ruby/rdoc-4.2.0/work/all/rdoc-4.2.0'