bundler installs gems in project rspec directory?

Having just converted my project to rails3 I now note that bundler
installs gems into a directory called rspec in the project root. Since
this defeats entirely the purpose of having central gem libraries I need
to know how to turn this 'feature' off.

Out of pathological curiosity I do not mind finding out how this
happened to me and why such a thing is even possible, but I can
certainly live without that information. However, I really do need to
know how to stop this from happening.

I found it.

I forgot to mention the solution:

in .bundle/config

BUNDLE_DISABLE_SHARED_GEMS: "0"

However, I seem to observe that running bundle install resets this value
to 1.