RE: 3.0 and 2.x parallel?

JB wrote Before we botch up our installation we wanted to make sure if ".configure -- prefix=/my/dir" suffices to completely isolate the 3.0 installation.

We actually manage to run them out of the same directory. The nuance is you have to set the dictionary path on the commandline for the 3.0 instances with -D and deal with a few collisions if you are using the stock directories/files.