[plt-scheme] read-line no echo

Hi,

I am trying to implement a password prompt where characters are not echoed. I have searched around but not found a solution. I have managed 
to kludge a solution by using (system ...) and accessing the bash command 'read -s'. Is there a scheme solution or does this need an extension 
written in C? I only need to support OS X and Linux.

TIA, 

--j
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