in reply to layout/configuration of deployed files

You could also reduce your boilerplate to one line: 

use lib $ENV{XX_ROOT} ? "$ENV{XX_ROOT}/lib" : "/x/foo/lib";

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Re^2: layout/configuration of deployed files
by Anonymous Monk on Mar 05, 2011 at 20:44 UTC
    Use the FindBin module. 
            use FindBin;
        use lib "$FindBin::Bin/../lib";

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