win32下怎么安裝rails4 ?

yakczh_cu

gem install rails --version 4.0.0.beta1 --no-ri --no-rdoc
Building native extensions.  This could take a while...
ERROR:  Error installing rails:
        ERROR: Failed to build gem native extension.

    g:/Ruby20/bin/ruby.exe extconf.rb
*** 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=g:/Ruby20/bin/ruby
        --with-atomic_reference-dir
        --without-atomic_reference-dir
        --with-atomic_reference-include
        --without-atomic_reference-include=${atomic_reference-dir}/include
        --with-atomic_reference-lib
        --without-atomic_reference-lib=${atomic_reference-dir}/
g:/Ruby20/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 g:/Ruby20/lib/ruby/2.0.0/mkmf.rb:516:in `try_link0'
        from g:/Ruby20/lib/ruby/2.0.0/mkmf.rb:814:in `try_run'
        from extconf.rb:24:in `<main>'


Gem files will remain installed in g:/Ruby20/lib/ruby/gems/2.0.0/gems/atomic-1.1.13 for inspection.
Results logged to g:/Ruby20/lib/ruby/gems/2.0.0/gems/atomic-1.1.13/ext/gem_make.out

e:\dev\nodejs\nw>gem update --system
Latest version currently installed. Aborting.

用gem裝不上

yakczh_cu

ruby-1.9.3-p374-i386-mingw32.7z         
rubyinstaller-1.9.3-p374.exe

我裝的ruby是后面的，是不是要裝第一個(gè)？
這兩個(gè)有什么區(qū)別？

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