I am using last ruby installed with the 1-click install, on Windows.

When i use extconf.rb files, I always get errror messages like this
one:
  checking for deflateReset() in z.lib... no
  checking for deflateReset() in libz.lib... no
  checking for deflateReset() in zlib.lib... no

I tried to install ruby-zlib from
http://raa.ruby-lang.org/project/ruby-zlib
but i have the same problems.

Can someone please help me ? How can I make extconf.rb files work ?
Any help would be greatly appreciated, since I really would like to use
ruby but can't figure how to solve problems like this one.