Instaling IRAF

[Marcus Vinicius M.Fernandes]

Hello

I've just intalled the Cygwin im my laptop and it's working well. But I'm an 
astrophysic and I would like to install a software named IRAF 
(http://iraf.noao.edu/iraf-homepage.html). This is a RPM. But the instalation 
does not proceed, showing messages about missing packages. The setup-
2.4...rpm is one of them.

Could you help me to install the IRAF software?

Thank you.
Marcus

Ps: The IRAF is easily installed under any Linux operating system.