I work almost entirely with pure Python packages with the same codebase for both Python2 and Python3 (param, imagen, holoviews), and thus I should be able to build noarch conda packages and not have to worry about different platforms. However, in some cases we need to build packages that specify different dependencies on Python2 compared to Python3. As far as we can tell, specifying the Python version for the package also means specifying the OS. Is there a way to build a package that is tied to a Python major version without being tied to a particular OS? If not, can that capability be added?