I found a similar problem described in:
http://groups.google.com/group/sdruby/browse_thread/thread/d3ba3a487714bdb4?pli=1
I installed build-essential ruby-dev 4.2 libruby1.8-dbg and retried
'sudo gem install rub-debug' after this, the gem installed correctly.
I suggest that there are missing
Indeed, if extconf.rb is used, there should be a dependancy on
ruby1.8-dev.
--
rubygems1.8 does not work - apppears misconfigured
https://bugs.launchpad.net/bugs/591575
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Status in “libgems-ruby” package in Ubuntu: Invalid
