[plt-scheme] drscheme and define-macro

Hi,

I'm new to scheme and functional languages in general.

Reading through 't-y-scheme' I can't seem to get
'define-macro' to work. 

The error message is:

'reference to undefined identifier: define-macro'

I've tried all available languages.
I'm using v202 on Windows and v201 on Linux.

Thanks,
Razvan

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