conda-build hangs forever on Mac OS -- scipy seems to be the culprit

[brian-rose]

I created this minimal example of what appears to be the same problem affecting the build of climlab, e.g. https://github.com/brian-rose/climlab/issues/88, conda/conda-build#3395

This package will build and test properly when you execute

conda build conda-recipe

from the root directory.

However if scipy is included in the run dependencies (remove the comment in meta.yaml), then conda-build will hang forever as described in the above issues.

[brian-rose]

As discussed in https://github.com/brian-rose/climlab/issues/88, the problem goes away with a particular conda configuration:

conda config --add channels conda-forge
conda config --add channels defaults
conda install pycryptosat conda-build
conda config --set sat_solver pycryptosat
conda config --set channel_priority strict

so that the .condarc file looks like

channels:
  - defaults
  - conda-forge
sat_solver: pycryptosat
channel_priority: strict

With this configuration the minimal package builds and tests successfully even when including scipy in the run dependencies.