[GiNaC-list] problem installing ginac on windows via cygwin

Hello all, I am trying to install ginac 1.3.3 onto a windows XP system via cygwin. For some reason when I run configure it cannot find libreadline although I have readline installed. From what I've read I suppose I must use CPPFLAGS to tell configure where readline is located but I'm not sure how to do this. Any help would be greatly appreciated. Matt Smith