I've installed ruby-opengl through sudo gem install because there were
errors otherwise and now I can't use it with 'ruby main.rb'. When I
typed 'sudo ruby main.rb' I think it worked but there were errors
considering hashes as they're changed in latest version of ruby (I think
I have different ruby versions as I'm also using RVM).
I know it's confusing but is there a way to somehow transfer gem from
root to rvm or maybe a way to access roots gems without sudo triggering
wrong version of ruby?


gem install ruby-opengl fails saying that it can't find rake executable
for rake-0.8.7. I can install rake via 'gem install' but it doesn't
really work because I can install it multiple times without it
complaining about rake being already installed.

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