.. blogpost:: :title: Build Tensorflow from source :keywords: python, debian, tensorflow :date: 2021-01-11 :categories: installation Tensorflow has no released for python 3.9 yet. To build it `from source `_, `bazel `_ must be installed first. :: curl -fsSL https://bazel.build/bazel-release.pub.gpg | gpg --dearmor > bazel.gpg sudo mv bazel.gpg /etc/apt/trusted.gpg.d/ echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list apt update apt install bazel bazel --version Then Tensorflow: :: pip install keras_preprocessing --no-deps git clone https://github.com/tensorflow/tensorflow.git cd tensorflow ./configure The last script prompts to ask question. One of them is the CPU optimization. Nothing or some suggestions: :: --copt=-mavx --copt=-mavx2 --copt=-mfma --copt=-mfpmath=both --copt=-msse4.2 Then build tensorflow: :: bazel build --config=opt //tensorflow/tools/pip_package:build_pip_package And finally: :: bazel-bin/tensorflow/tools/pip_package/build_pip_package --nightly_flag tensorflow_pkg It took me 5 to 6 hours to build the whole package. Then `pip install ...`.