If you specify them !!!
Buildout is a fantastic tool to build environnement isolated with eggs. But virtualenv with setuptools too !!
When you create an egg you can specify yours dependency in setup.py in install_requires section. Setuptools or Distribute take care of that so all things take care of that. The generation of script via entry_point or via zc.recipe.egg also. Sys path generated included dependency and it’s simply work. Number of buildout after one year break because a lack of specification of dependency (with specific version of course). IMO install_requires is better than fixing version in your buildout because it’s simply works without or with buildout.
