I wanted to install rmagick on Win7 but it can't install:
Is there any way to make it work?

    C:\>gem list -r rmagick

    *** REMOTE GEMS ***

    rmagick (2.13.1)
    rmagick4j (0.3.7, 0.3.4 java)


    C:\>gem install rmagick
    Building native extensions.  This could take a while...
    ERROR:  Error installing rmagick:
            ERROR: Failed to build gem native extension.

    c:/ruby/bin/ruby.exe extconf.rb
    checking for Ruby version >= 1.8.5... yes
    Invalid drive specification.
    Unable to get ImageMagick version
    *** 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:/ruby/bin/ruby


    Gem files will remain installed in
c:/ruby/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1 for inspection.
    Results logged to
c:/ruby/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1/ext/RMagick/gem_make.out


    C:\>ruby try.rb
    c:/ruby/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1/lib/RMagick.rb:11:in
`require': no such file to load
     -- RMagick2.so (LoadError)
            from
c:/ruby/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1/lib/RMagick.rb:11:in
`<top (required)>'

            from try.rb:3:in `require'
            from try.rb:3:in `<main>'
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