Looks like dev-util/be does not work with python 3.1,2.4 and works with 2.5.
drwxr-xr-x - app-misc
drwxr-xr-x - dev-tex
drwxr-xr-x - dev-util
drwxr-xr-x - licenses
drwxr-xr-x - media-gfx
drwxr-xr-x - media-sound
drwxr-xr-x - profiles
drwxr-xr-x - sci-physics
drwxr-xr-x - virtual