newbie: how to acquire /usr/include files for hello world

I've got a 'Edgy' VMware image I want to use for arm cross compiling (later) but there aren't any native /usr/include files - gcc is 4.1.2. I cannot determine what package to get that provides the include files. I'm a SYS-V person - maybe they're already loaded somewhere else and you always have to specify an include path to find them but that doesn't seem reasonable. Can anyone tell me what package to get or where they are located if it's not in /usr/include?

This image came off the VMware site and it's the second Ubuntu image that was missing the /usr/include files - makes me wonder if I'm looking in the wrong place.