Installing Hpricot on Ruby 1.9.1 on Windows

Question

I am trying to install hpricot using the command:

>gem install hpricot -v 0.8.2
Building native extensions.  This could take a while...
ERROR:  Error installing hpricot:
    ERROR: Failed to build gem native extension.

C:/Ruby19/bin/ruby.exe extconf.rb
checking for stdio.h... * 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:/Ruby19/bin/ruby
C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:362:in try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:431:intry_cpp'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:809:in block in have_header'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:668:inblock in checking_for'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:274:in block (2 levels) in postpone'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:248:inopen'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:274:in block in postpone'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:248:inopen'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:270:in postpone'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:667:inchecking_for'
    from C:/Ruby19/lib/ruby/1.9.1/mkmf.rb:808:in have_header'
    from extconf.rb:2:in'

Gem files will remain installed in C:/Ruby19/lib/ruby/gems/1.9.1/gems/hpricot-0.8.2 for inspection.
Results logged to C:/Ruby19/lib/ruby/gems/1.9.1/gems/hpricot-0.8.2/ext/fast_xs/gem_make.out

it mentions I need to install "development tools" but I have no idea what that refers to. Any suggestions?

Answer 1

Try:

gem install hpricot --platform=mswin32

Answer 2

Install the devkit at rubyinstaller.org/downloads