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ZRoundup looks only in certain places for its home directory. 
In  
fact, Zope has a method for contructing an arbitrary list of  
directories that it searches for Products (the environment 
variable  
PRODUCTS_PATH). So to find itself, ZRoundup needs to 
search that  
path. Fortunately, that path is available from the __path__ 
property  
of the Products object. The attached diff shows code that 
works for me