Building more than one recipe fails about conda-build-all HOT 5 CLOSED

find my_recipes -name meta.yaml -exec echo {} \; -exec cat {} \;
my_recipes/recipe_a/meta.yaml
package:
  name: recipe_a
  version: 2.4

requirements:
  run:
    - python
  build:
    - python

my_recipes/recipe_b/meta.yaml
package:
  name: recipe_b
  version: 3.2

requirements:
  build:
    - recipe_a
    - numpy x.x
  run:
    - recipe_a
    - python
    - numpy x.x

CONDA_NPY=10 conda build-all my_recipes --matrix-conditions 'python >=2.7'
Using Anaconda Cloud api site https://api.anaconda.org
Fetching package metadata .........
Resolving distributions from 2 recipes... 
Computed that there are 9 distributions from the 2 recipes:
Resolved dependencies, will be built in the following order: 
    recipe_a-2.4-py27_0 (will be built: True)
    recipe_a-2.4-py34_0 (will be built: True)
    recipe_a-2.4-py35_0 (will be built: True)
    recipe_b-3.2-np110py27_0 (will be built: True)
    recipe_b-3.2-np111py27_0 (will be built: True)
    recipe_b-3.2-np110py34_0 (will be built: True)
    recipe_b-3.2-np111py34_0 (will be built: True)
    recipe_b-3.2-np110py35_0 (will be built: True)
    recipe_b-3.2-np111py35_0 (will be built: True)

> conda info
Current conda install:

             platform : osx-64
        conda version : 4.1.9
    conda-env version : 2.5.2
  conda-build version : 1.21.5
       python version : 2.7.12.final.0
     requests version : 2.9.1
     root environment : /Users/pelson/miniconda  (writable)
  default environment : /Users/pelson/miniconda/envs/_dev_conda_build_all
     envs directories : /Users/pelson/miniconda/envs
        package cache : /Users/pelson/miniconda/pkgs
         channel URLs : https://conda.anaconda.org/t/<TOKEN>/conda-forge/osx-64/
                        https://conda.anaconda.org/t/<TOKEN>/conda-forge/noarch/
                        https://repo.continuum.io/pkgs/free/osx-64/
                        https://repo.continuum.io/pkgs/free/noarch/
                        https://repo.continuum.io/pkgs/pro/osx-64/
                        https://repo.continuum.io/pkgs/pro/noarch/
          config file : /Users/pelson/.condarc
         offline mode : False
    is foreign system : False