More such dependencies; should have trusted jkontrik fully. Well, the…

… added comment is nice, and only a few minutes were lost.

conanfile.py

@@ -28,14 +28,11 @@ def configure(self):
         if self.options.build:
             # Currently need all headers;
             # plus libs: chrono, filesystem, program_options, thread, timer (and all headers).
-            # `filesystem` requires `atomic`.
+            # `filesystem` requires atomic.  `thread` requires container, date_time, exception.
             # (Boost provides the with_* way of specifying it also; the Conan Boost pkg only has without_*.)
-            self.options["boost"].without_container = True
             self.options["boost"].without_context = True
             self.options["boost"].without_contract = True
             self.options["boost"].without_coroutine = True
-            self.options["boost"].without_date_time = True
-            self.options["boost"].without_exception = True
             self.options["boost"].without_fiber = True
             self.options["boost"].without_graph = True
             self.options["boost"].without_graph_parallel = True