Trouble installing using "gem install rxsd"

[adblockist]

I'm running into an error trying to install RXSD using gem.

My environment is Ruby 1.9.2p180 , Windows 7 64-bit.

This is what I captured from standard error:

ERROR: Error installing rxsd:
ERROR: Failed to build gem native extension.

    E:/ruby/ruby-192/bin/ruby.exe extconf.rb

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checking for socket() in -lsocket... missing: to_int
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no
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checking for gethostbyname() in -lnsl... no
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checking for atan() in -lm... yes
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checking for inflate() in -lz... no
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checking for inflate() in -lzlib... no
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checking for inflate() in -lzlib1... no
extconf failure: need zlib
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Gem files will remain installed in E:/ruby/ruby-192/lib/ruby/gems/1.9.1/gems/libxml-ruby-1.1.4 for inspection.
Results logged to E:/ruby/ruby-192/lib/ruby/gems/1.9.1/gems/libxml-ruby-1.1.4/ext/libxml/gem_make.out

I'm quite new to Ruby so it might be something obvious to more experienced Ruby programmers.

Thanks.