getenv in FreeBSD 7

[Doug Hardie]

Somewhere between FreeBSD 6.2 and 7.0 getenv has been changed to  
return a null if an environment variable is set but has no value.  I  
don't find anything anywhere in the documentation/man pages on this.   
As a result, you cannot distinguish between a variable that is not set  
and one that is set to a value of "".  Is this a bug or a feature  
change?
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