How to print output and ask input on the same line

[leledumbo]

This is my main function:

main = do
  putStr "What's the value that each equation must satisfy? "
  c <- readLn
  putStr "How many unknowns are there? "
  n <- readLn
  sequence_ (result c n)

Using runhugs / winhugs / ghci, I can see every output of putStr before it
stops for readLn. But compiling it with ghc, it just stops for readLn and
putStr output is printed together with sequence_' one. So, instead of:

What's the value that each equation must satisfy? <stop for readLn>
How many unknowns are there? <stop for readLn>
<output of sequence_>

I got:

<stop for readLn>
<stop for readLn>
What's the value that each equation must satisfy?
How many unknowns are there?
<output of sequence_>

Hope that's clear enough.
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