--- a
+++ b/build-prereq.sh
@@ -0,0 +1,175 @@
+#!/bin/bash
+set -euo pipefail
+
+# Copyright 2017 Google LLC.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from this
+#    software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+echo ========== This script is only maintained for Ubuntu 22.04.
+echo ========== Load config settings.
+
+source settings.sh
+
+################################################################################
+# Misc. setup
+################################################################################
+
+note_build_stage "Install the runtime packages"
+
+./run-prereq.sh
+
+note_build_stage "Update package list"
+
+sudo -H apt-get -qq -y update
+
+note_build_stage "build-prereq.sh: Install development packages"
+
+# Need to wait for dpkg lock (see internal)
+wait_for_dpkg_lock
+sudo -H NEEDRESTART_MODE=a apt-get -qq -y install pkg-config zip g++ zlib1g-dev unzip curl git wget > /dev/null
+
+
+################################################################################
+# bazel
+################################################################################
+
+note_build_stage "Install bazel"
+
+function ensure_wanted_bazel_version {
+  local wanted_bazel_version=$1
+  rm -rf ~/bazel
+  mkdir ~/bazel
+
+  if
+    v=$(bazel --bazelrc=/dev/null --ignore_all_rc_files version) &&
+    echo "$v" | awk -v b="$wanted_bazel_version" '/Build label/ { exit ($3 != b)}'
+  then
+    echo "Bazel ${wanted_bazel_version} already installed on the machine, not reinstalling"
+  else
+    pushd ~/bazel
+    curl -L -O https://github.com/bazelbuild/bazel/releases/download/"${wanted_bazel_version}"/bazel-"${wanted_bazel_version}"-installer-linux-x86_64.sh
+    chmod +x bazel-*.sh
+    ./bazel-"${wanted_bazel_version}"-installer-linux-x86_64.sh --user > /dev/null
+    rm bazel-"${wanted_bazel_version}"-installer-linux-x86_64.sh
+    popd
+  fi
+}
+
+ensure_wanted_bazel_version "${DV_BAZEL_VERSION}"
+
+# This is used for building examples_from_stream.so later.
+time sudo ./tools/build_absl.sh
+
+################################################################################
+# TensorFlow
+################################################################################
+
+note_build_stage "Download and configure TensorFlow sources"
+
+# Getting the directory before switching out.
+DV_DIR=$(pwd)
+
+if [[ ! -d ../tensorflow ]]; then
+  note_build_stage "Cloning TensorFlow from github as ../tensorflow doesn't exist"
+  (cd .. && git clone https://github.com/tensorflow/tensorflow)
+fi
+
+# PYTHON_BIN_PATH and PYTHON_LIB_PATH are set in settings.sh.
+# I had to remove this line in tensorflow v2.5.0 because I got an ERROR:
+# rule() got unexpected keyword argument 'incompatible_use_toolchain_transition'.
+# I changed the llvm path to zip to avoid flakiness.
+(cd ../tensorflow &&
+ git checkout "${DV_CPP_TENSORFLOW_TAG}" &&
+ echo | ./configure)
+
+# We want to use a newer absl version. So I grabbed the one from TensorFlow
+# r2.13. Eventually we'll want to update to TF 2.13. But for now this works.
+# TODO: After updating to v2.13, we can remove this.
+wget https://raw.githubusercontent.com/tensorflow/tensorflow/r2.13/third_party/absl/workspace.bzl -O ../tensorflow/third_party/absl/workspace.bzl
+rm -f ../tensorflow/third_party/absl/absl_designated_initializers.patch
+# To get the @com_google_absl//absl/strings:string_view target:
+sed -i -e 's|b971ac5250ea8de900eae9f95e06548d14cd95fe|29bf8085f3bf17b84d30e34b3d7ff8248fda404e|g' ../tensorflow/third_party/absl/workspace.bzl
+sed -i -e 's|8eeec9382fc0338ef5c60053f3a4b0e0708361375fe51c9e65d0ce46ccfe55a7|affb64f374b16877e47009df966d0a9403dbf7fe613fe1f18e49802c84f6421e|g' ../tensorflow/third_party/absl/workspace.bzl
+sed -i -e 's|patch_file = \["//third_party/absl:absl_designated_initializers.patch"\],||g' ../tensorflow/third_party/absl/workspace.bzl
+
+# Update tensorflow.bzl. This updates the `pybind_extension` rule to use the
+# _message.so file.
+patch ../tensorflow/tensorflow/tensorflow.bzl "${DV_DIR}"/third_party/tensorflow.bzl.patch
+
+# I want to replace this part in ../tensorflow/tensorflow/workspace2.bzl
+# From:
+# tf_http_archive(
+#     name = "pybind11",
+#     urls = tf_mirror_urls("https://github.com/pybind/pybind11/archive/v2.10.0.tar.gz"),
+#     sha256 = "eacf582fa8f696227988d08cfc46121770823839fe9e301a20fbce67e7cd70ec",
+#     strip_prefix = "pybind11-2.10.0",
+#     build_file = "//third_party:pybind11.BUILD",
+#     system_build_file = "//third_party/systemlibs:pybind11.BUILD",
+# )
+# To:
+# tf_http_archive(
+#     name = "pybind11",
+#     urls = tf_mirror_urls("https://github.com/pybind/pybind11/archive/a7b91e33269ab6f3f90167291af2c4179fc878f5.zip"),
+#     sha256 = "09d2ab67e91457c966eb335b361bdc4d27ece2d4dea681d22e5d8307e0e0c023",
+#     strip_prefix = "pybind11-a7b91e33269ab6f3f90167291af2c4179fc878f5",
+#     build_file = "//third_party:pybind11.BUILD",
+#     system_build_file = "//third_party/systemlibs:pybind11.BUILD",
+# )
+sed -i -e 's|v2.10.0.tar.gz|a7b91e33269ab6f3f90167291af2c4179fc878f5.zip|g' ../tensorflow/tensorflow/workspace2.bzl
+sed -i -e 's|eacf582fa8f696227988d08cfc46121770823839fe9e301a20fbce67e7cd70ec|09d2ab67e91457c966eb335b361bdc4d27ece2d4dea681d22e5d8307e0e0c023|g' ../tensorflow/tensorflow/workspace2.bzl
+sed -i -e 's|pybind11-2.10.0|pybind11-a7b91e33269ab6f3f90167291af2c4179fc878f5|g' ../tensorflow/tensorflow/workspace2.bzl
+
+# Inspired by part of https://raw.githubusercontent.com/tensorflow/tensorflow/r2.11/third_party/protobuf/protobuf.patch.
+# This is necessary for Python 3.10.
+cat > third_party/protobuf.patch <<- EOM
+diff --git a/python/google/protobuf/pyext/message.cc b/python/google/protobuf/pyext/message.cc
+index 3530a9b37..c31fa8fcc 100644
+--- a/python/google/protobuf/pyext/message.cc
++++ b/python/google/protobuf/pyext/message.cc
+@@ -2991,8 +2991,12 @@ bool InitProto2MessageModule(PyObject *m) {
+         reinterpret_cast<PyObject*>(
+             &RepeatedCompositeContainer_Type));
+ 
+-    // Register them as collections.Sequence
++    // Register them as MutableSequence.
++#if PY_MAJOR_VERSION >= 3
++    ScopedPyObjectPtr collections(PyImport_ImportModule("collections.abc"));
++#else
+     ScopedPyObjectPtr collections(PyImport_ImportModule("collections"));
++#endif
+     if (collections == NULL) {
+       return false;
+     }
+EOM
+
+# TODO: Test removing this version pinning.
+note_build_stage "Set pyparsing to 2.2.2 for CLIF."
+export PATH="$HOME/.local/bin":$PATH
+pip3 uninstall -y pyparsing && pip3 install -Iv 'pyparsing==2.2.2'
+
+note_build_stage "build-prereq.sh complete"