After downloading source project, you should update git submodules firstly by using below script.
[about scripts]
update_submod_source: checkout source branch, it has exclusive access to the ISP Dept.
update_submod_lib: checkout library branch, it has access to the people except ISP Dept.

For example:
~$./update_submod_lib

[about compile]
cd build/linux dir, start compiling:
~$./make-Makefiles.bash

libs are installed to build/linux/all_lib.