$ perl -V:randbits
On my Ubuntu box this prints randbits='48'; On your build of Perl I suspect it's 15.
(This value is figured out at build-time and is supposed to represent how many bits the respective PRNG C library function actually provides.)
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Re^3: Random numbers are not random enough on Windows
by ikegami (Pope) on Oct 28, 2009 at 15:26 UTC