Что делать Kivy build failed?

BUILD FAILED
/home/shamatov/.buildozer/android/platform/android-sdk-20/tools/ant/build.xml:601: The following error occurred while executing this line:
/opt/kivy_client/gmaps/libs/android/google-play-services_lib/build.xml:55: sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable.

Total time: 0 seconds
Traceback (most recent call last):
  File "build.py", line 517, in <module>
    make_package(args)
  File "build.py", line 365, in make_package
    subprocess.check_call([ANT, arg])
  File "/usr/lib/python2.7/subprocess.py", line 541, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['ant', 'debug']' returned non-zero exit status 1