How did I fix Ruby and Java on Sabayon Linux

I use Sabayon Linux on my laptop and I was trying to make ruby work, unfortunately when I run ruby from the command line it gave me this error:

/usr/lib64/ruby/1.9.1/rubygems.rb:30:in `require': cannot load such file -- rubygems/defaults (LoadError)
        from /usr/lib64/ruby/1.9.1/rubygems.rb:30:in `<top (required)>'
        from <internal:gem_prelude>:1:in `require'
        from <internal:gem_prelude>:1:in `<compiled>'

The problem is that I am trying to run ruby 1.9.1 but the rubygems installation requires a different version

Googling a bit about it, I have found this page that taught me how to change the default Ruby version. First of all I got a list of installed executables:

$eselect ruby list
Available Ruby profiles:&lt;/pre&gt;
[1]   ruby19 *
[2]   ruby20
[3]   ruby21 (with Rubygems)


Then I switch to the latest ruby,

$ sudo eselect ruby set ruby21
Sorry, try again.
!!! SYNC setting found in make.conf.
This setting is Deprecated and no longer used.  Please ensure your 'sync-type' and 'sync-uri' are set correctly in /etc/portage/repos.conf/gentoo.conf
Successfully switched to profile:


And it worked!!!

$ ruby -v
ruby 2.1.7p400 (2015-08-18 revision 51632) [x86_64-linux]


Java was a bit more complicated. Icedtea was installed by default and I had already installed my own version on the JDK from Oracle.This time eselect did not allow me to switch to my custom JDK, so I started to investigate a bit and I found out that I had to make  ${HOME}/.gentoo/java-config-2/current-user-vm point to my JDK installation directory. So I did

$ mkdir   ${HOME}/.gentoo
$ mkdir   ${HOME}/.gentoo/java-config-2
$ cd  ${HOME}/.gentoo/java-config-2
$ ln -s /opt/jdk1.7.0_71/ current-user-vm
$ java -version
$ java version &quot;1.7.0_71&quot;
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

And voilà! It worked as well

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