Cannot use HGL package

[David Thayer]

To Some Haskell Guru Out There,

When I list installed packages using ghc-pkg I can see that HGL is
installed but when I try to use it I get an error message saying that this
is an unknown package.  Can anyone help me please.  I am trying to work
through the examples in 'School of Epression' and this is a show stopper
for me.

Thanks in advance
David
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