Obtaining "proprietary binaries"You need to obtain "proprietary binaries" which is not include the Android Open-Source Project.
To run the script for obtaining device's "proprietary binaries"
Get "proprietary binaries".
$ wget https://dl.google.com/dl/android/aosp/broadcom-wingray-iml74k-2c8a74c6.tgz
$ wget https://dl.google.com/dl/android/aosp/nvidia-wingray-iml74k-e5226417.tgz
$ for i in *wingray-iml74k* ; do tar zxvf $i ; done
$ for i in ./extract-*-wingray.sh ; do $i ; done
building the configuration that matches a devicerunning to build for wingray.
$ . build/envsetup.sh
$ lunch full_wingray-userdebug