[HOpenGL] Haddock installation question

[Andre W B Furtado]

I got the following error while trying to compile Haddock (./configure
step):

error: 'lex' or 'flex' is required to compile GHC

>From where can I download 'lex' or 'flex'? Do they come with Cygwin/GHC
installation packages?

My config is: Windows XP under Cygwin, GHC-5.04.2

Thanks,
-- Andre