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Whenever I try to debug my ruby application using my MCI version (1.8.6) Netbeans will ask if I want to use fast debugger or slow, but if I choose slow it will say that I must use fast debugger. So I try to install it and it fails. It reports a problem with nmake. I've posted a description of the problem in my blog with screenshots and a possible workaround: http://www.definenull.com/content/netbeans-6-ruby-fast-debugger
Thanks for the report, I think this is related to changes in the more recent versions of ruby-debug-ide. Probably needs a fix there too, I'll have a loot at what should be done on the IDE side.