Ruby-debug install error: failed to build gem native extension?

The problem here can be that the install script is going off to get the Ruby Header files over the web (to build the debugger gem against) but doesn't find them for the particular patch-level of Ruby you're after. This is what's going on in the output line.

The ruby-debug gem is not compatible to Ruby 1.9.2. You need use the gem ruby-debug19.

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