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Some bullets points:

• The numpy version is controlled by the environment variable CONDA_NPY (e.g.: export CONDA_NPY=18).
• The python version is controlled by the environment variable CONDA_PY (e.g.: export CONDA_PY=27).
• When rebuilding something with the same version we need to increment the build number in the meta.yaml. That will ensure the installation of the new version, rather than just what is sitting around in their cache.
• To avoid the package cache we can add a -f to the install to force downloading, like: conda install iris -f
• There is no need for subdirs like np18py27.
• conda build iris will automatically build all the other dependencies (biggus, pyke, cartopy) if it finds a recipe for the requirement at the same directory level.
• That is a strong incentive to set: conda config --set binstar_upload yes and have all packages uploaded with one "build".