public IEnumerable<IBuildable> GetBuildDependencies(ProjectBuildOptions buildOptions)
			{
				List<IBuildable> result = new List<IBuildable>();
				foreach (IBuildable b in wrapped.GetBuildDependencies(buildOptions)) {
					result.Add(factory.GetWrapper(b));
				}
				lock (cachedBuildDependencies) {
					if (buildOptions != null)
						cachedBuildDependencies[buildOptions] = result;
					else
						cachedBuildDependenciesForNullOptions = result;
				}
				return result;
			}