Apparently newgem has a dependency on rubigen.
I'd expect that
gem install newgem
would auto-install its dependencies, then it.

Thanks!
-=r

C:\dev\ruby_backtracer>gem install newgem
ERROR:  Error installing newgem:
        newgem requires rubigen (>= 1.5.1, runtime)

C:\dev\ruby_backtracer>gem install rubigen
Successfully installed rubigen-1.5.1

C:\dev\ruby_backtracer>gem install newgem
Successfully installed newgem-1.2.3