Litert Enable TF OP support (Flex delegate) pip package

TensorFlow
,
1

It used to be fairly easy to build and cross compile the tflite runtime pip package with the flex delegate enabled.

CI_DOCKER_EXTRA_PARAMS="-e CUSTOM_BAZEL_FLAGS=--define=tflite_pip_with_flex=true" \
  tensorflow/tools/ci_build/ci_build.sh PI-PYTHON39 \
  tensorflow/lite/tools/pip_package/build_pip_package_with_bazel.sh aarch64

Which worked at the time but seems to of stopped at python3.9 as replacing with 311 cause an error

In the newer LiteRT documentation we have

make -C tensorflow/lite/tools/pip_package docker-build \
  TENSORFLOW_TARGET=aarch64 PYTHON_VERSION=3.11

Which works but I can not find any reference of doing “CUSTOM_BAZEL_FLAGS=–define=tflite_pip_with_flex=true” with the newer method?