rubyinstaller: Failling to Test DevKit Installation

Hi guys, I’m trying to set my dev environment on my PC, so I went through the installation process and got stuck: (I did the previous steps, pasting the last two only) First I did this:

C:\Ruby200-x64\DevKit>ruby dk.rb install
[INFO] Skipping existing gem override for 'C:/Ruby200-x64'
[WARN] Skipping existing DevKit helper library for 'C:/Ruby200-x64'

And then this:

C:\Ruby200-x64\DevKit>gem install bson_ext --platform=ruby -p
Fetching: bson-1.8.4.gem (100%)
Successfully installed bson-1.8.4
Fetching: bson_ext-1.8.4.gem (100%)
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing bson_ext:
        ERROR: Failed to build gem native extension.

C:/Ruby200-x64/bin/ruby.exe extconf.rb
checking for asprintf()... *** 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}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=C:/Ruby200-x64/bin/ruby
C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:431:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:516:in `try_link0'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:531:in `try_link'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:717:in `try_func'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:1001:in `block in have_func'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:892:in `block in checking_for'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:337:in `block (2 levels) in postpone'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:307:in `open'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:337:in `block in postpone'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:307:in `open'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:333:in `postpone'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:891:in `checking_for'
    from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:1000:in `have_func'
    from extconf.rb:3:in `<main>'

I also tried Scenario A and B of the troubleshooting guide, both without success. Moving out to Linux until then… Thank you.