DO NOT MERGE: try to fix macOS CI

Assisted-by: GPT-5.6 Sol <codex@openai.com>

Author: lidavidm

ci/scripts/jni_macos_build.sh

@@ -77,8 +77,25 @@ cmake \
 cmake --build "${build_dir}/cpp" --target install
 github_actions_group_end
 
+absl_build_dir="${build_dir}/cpp/_deps/absl-build"
+absl_cmake_dir=""
+if [ -d "${absl_build_dir}" ]; then
+  github_actions_group_begin "Installing bundled Abseil"
+  cmake --build "${build_dir}/cpp" --target _deps/absl-build/all --config Release
+  cmake --install "${absl_build_dir}" --prefix "${install_dir}" --config Release
+  absl_cmake_dir="${install_dir}/lib/cmake/absl"
+  if [ ! -f "${absl_cmake_dir}/abslConfig.cmake" ]; then
+    echo "Bundled Abseil CMake package was not installed in ${absl_cmake_dir}" >&2
+    exit 1
+  fi
+  github_actions_group_end
+fi
+
 JAVA_JNI_CMAKE_ARGS="-DProtobuf_ROOT=${build_dir}/cpp/_deps/protobuf-build"
 JAVA_JNI_CMAKE_ARGS+=" -DProtobuf_SRC_ROOT_FOLDER=${build_dir}/cpp/_deps/protobuf-src"
+if [ -n "${absl_cmake_dir}" ]; then
+  JAVA_JNI_CMAKE_ARGS+=" -Dabsl_DIR=${absl_cmake_dir}"
+fi
 export JAVA_JNI_CMAKE_ARGS
 "${source_dir}/ci/scripts/jni_build.sh" \
   "${source_dir}" \