jinja 2.9.4 buildroot

PYTHONPATH="/home/lionel/src/ambix/buildroot/output/target/usr/lib/python3.5/sysconfigdata/:/home/lionel/src/ambix/buildroot/output/target/usr/lib/python3.5/site-packages/" /home/lionel/src/ambix/buildroot/output/host/usr/bin/python3.5 support/scripts/pycompile.py /home/lionel/src/ambix/buildroot/output/target/usr/lib/python3.5
Traceback (most recent call last):
  File "/home/lionel/src/ambix/buildroot/output/host/usr/lib/python3.5/py_compile.py", line 125, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 700, in source_to_code
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/home/lionel/src/ambix/buildroot/output/target/usr/lib/python3.5/site-packages/jinja2/asyncfilters.py", line 24

        ^
SyntaxError: 'yield' inside async function

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/lionel/src/ambix/buildroot/output/host/usr/lib/python3.5/compileall.py", line 145, in compile_file
    optimize=optimize)
  File "/home/lionel/src/ambix/buildroot/output/host/usr/lib/python3.5/py_compile.py", line 129, in compile
    raise py_exc
py_compile.PyCompileError:   File "/home/lionel/src/ambix/buildroot/output/target/usr/lib/python3.5/site-packages/jinja2/asyncfilters.py", line 24
    yield item
             ^
SyntaxError: 'yield' inside async function