how to tell if curses is installed?

[Tom Fowle]

Trying to configure asomewhat old satelite tracking program 
"Predict2.2...
the ./configure script claims it can't find either gcc or curses.h
gcc is obviously present and accounted for, but I'm not sure how to tell if
the curses library is installed.

presume it is a part of debian wheezy's normal install?
but general searches don't reveal a way of finding out, curses isn't, I
guess, a "package"

Thanks
tom Fowle