Now that you have a first minimal configuration, it is time to build the toolchain for cross-compiling. To do this, just enter make again. The build starts downloading and compiling each needed part of the toolchain, and later continues with building the first firmware image. Later one can be taken as proof of a working ADK.
Already experienced in compiling gcc? Then you know...If not, better be told that it takes really long to finish. In the meantime I suggest reading the next chapter dealing with internals about cross-compiling.