* Package:    dev-ruby/dep_selector-0.1.1
 * Repository: gentoo
 * Maintainer: ruby@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux ruby_targets_ruby20 ruby_targets_ruby21 userland_GNU
 * FEATURES:   preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
 * Running unpack phase for all ...
>>> Unpacking dep_selector-0.1.1.tar.gz to /var/tmp/portage/dev-ruby/dep_selector-0.1.1/work/all
>>> Source unpacked in /var/tmp/portage/dev-ruby/dep_selector-0.1.1/work
>>> Preparing source in /var/tmp/portage/dev-ruby/dep_selector-0.1.1/work ...
 * Running prepare phase for all ...
 * Running source copy phase for ruby20 ...
 * Running source copy phase for ruby21 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-ruby/dep_selector-0.1.1/work ...
 * Running configure phase for ruby20 ...
checking for main() in -lgecodesupport... yes
checking for main() in -lgecodekernel... yes
checking for main() in -lgecodeint... yes
checking for main() in -lgecodeminimodel... yes
checking for main() in -lgecodesearch... yes
creating Makefile
 * Running configure phase for ruby21 ...
checking for main() in -lgecodesupport... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
	--with-opt-dir
	--without-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib64
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/usr/bin/ruby21
	--with-gecodesupportlib
	--without-gecodesupportlib
/usr/lib64/ruby/2.1.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /usr/lib64/ruby/2.1.0/mkmf.rb:541:in `try_link0'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:556:in `try_link'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:736:in `try_func'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:967:in `block in have_library'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:912:in `block in checking_for'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:351:in `block (2 levels) in postpone'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:321:in `open'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:351:in `block in postpone'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:321:in `open'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:347:in `postpone'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:911:in `checking_for'
	from /usr/lib64/ruby/2.1.0/mkmf.rb:962:in `have_library'
	from extconf.rb:49:in `<main>'
 * ERROR: dev-ruby/dep_selector-0.1.1::gentoo failed (configure phase):
 *   extconf.rb failed
 * 
 * Call stack:
 *     ebuild.sh, line   90:  Called src_configure
 *   environment, line 4353:  Called ruby-ng_src_configure
 *   environment, line 4045:  Called _ruby_each_implementation 'each_ruby_configure'
 *   environment, line  512:  Called _ruby_invoke_environment 'ruby21' 'each_ruby_configure'
 *   environment, line  607:  Called each_ruby_configure
 *   environment, line  891:  Called die
 * The specific snippet of code:
 *       ${RUBY} -Cext/dep_gecode extconf.rb || die "extconf.rb failed"
 * 
 * If you need support, post the output of `emerge --info '=dev-ruby/dep_selector-0.1.1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-ruby/dep_selector-0.1.1::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 =dep_selector-0.1.1
 * The complete build log is located at '/var/log/portage/dev-ruby:dep_selector-0.1.1:20150929-235439.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-ruby/dep_selector-0.1.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-ruby/dep_selector-0.1.1/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-ruby/dep_selector-0.1.1/work/ruby21/dep-selector-0.1.1'
 * S: '/var/tmp/portage/dev-ruby/dep_selector-0.1.1/work/ruby21/dep-selector-0.1.1'