rpg works by installing everything on a common directory: https://github.com/rtomayko/rpg

If rubygems did this, everything would be much better.

There is one problem though, and it is that some libs are bad citizens and install stuff outside of lib|bin and depend on it (haml's VERSION file is an example of this), and that sucks.

rpg has a 'shitlist' with fixes for specific cases: https://github.com/rtomayko/rpg/blob/master/rpg-shit-list.sh...