[darwinbuild] Building ChatServer

I followed the directions on the darwinbuild web pages, including setting up a disk image for builds, but I can't get very many things to build. I tried to run darwinbuild ChatServer and I got an error that make was not found. I next ran darwinbuild xnu, and that succeeded, but now the ChatServer build gives an error that gcc can't create executables. I have successfully built Libinfo, but for example I have been unable to build WebCore, Security, or ChatServer. Am I missing a step here?