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I was able to reproduce the problem of the environment variable 
returning None for a short time (it for some reason stopped doing that 
and started to do what I expected).  While I could, though, I was able to 
get the right values using distutils.sysconfig.get_config_var().

The attached file adds a little bit more debugging output and also 
switches over to using distutils.sysconfig.get_config_var() instead of 
sys.getenv().  Let me know if that fixes the problem.