global random number generator initialisation

[Ian Lynagh]

The library report, in "17.3  The global random number generator", says

    It is initialised automatically in some system-dependent fashion,
    for example, by using the time of day, or Linux's kernel random
    number generator.

However, under Linux "randomIO :: IO Int" seems to generate the same
values on each run.

    The IO versions, randomRIO and randomIO, use the global random
    number generator (see Section 17.3).

While the report doesn't require it to be set to something pseudo random
it would be nice if it was. Is there an obvious way to set it to
something pseudo random in Haskell? The Time module isn't as well
equiped as it could be for the task.


Thanks
Ian