Why ruby installed from RubyInstaller doesn't find dll's placed inside gem/lib folder?

My system: windows 7 x64.

I've installed:

• ruby from RubyInstaller (1.8.7)
• gem install rake
• gem install libxml-ruby --platform=mswin32

Now, when I make:

require 'xml'

I get error about missing libxml2-2.dll (and libiconv-2.dll). I can find those two libraries in 'Ruby187\lib\ruby\gems\1.8\gems\libxml-ruby-1.1.4-x86-mswin32-60\lib\'. When I copy them into 'Ruby187\bin' folder everything works.

But...

If I install ruby from old OneClick Installer, libxml-ruby works without copying those dll's into ruby\bin folder. I've looked into PATH variable - it's not pointing into libxml-ruby lib folder, so IMHO ruby finds them in some other way开发者_StackOverflow社区.

And question. What can I do, so ruby from RubyInstaller act similarily to the one from OneClick Installer? I don't want to add \lib folder into PATH (OneClick Installer doesn't need that) and I don't want to copy dll's into Ruby\bin

You could also try RubyStack installer, if seing no way around it. (I have it working with many gems, in Win 7 64 bits, no issues to date...)