diff --git a/buildbot/build_tflite.sh b/buildbot/build_tflite.sh
index 883712d8..e83a895f 100755
--- a/buildbot/build_tflite.sh
+++ b/buildbot/build_tflite.sh
@@ -16,37 +16,49 @@
 
 set -e
 
+if [[ -z "${TFLITE_SYSROOT}" ]]; then
+  EXTRA_CMAKE_FLAGS=" "
+else
+  EXTRA_CMAKE_FLAGS="-DCMAKE_SYSROOT=${TFLITE_SYSROOT} "
+fi
+
+echo extra cmake flags: ${EXTRA_CMAKE_FLAGS}
+
 readonly CPUINFO_REPOSITORY="https://github.com/pytorch/cpuinfo"
-readonly CPUINFO_TAG="5e63739504f0f8e18e941bd63b2d6d42536c7d90"
+readonly CPUINFO_TAG="ef634603954d88d2643d5809011288b890ac126e"
 
 readonly RUY_REPOSITORY="https://github.com/google/ruy"
-readonly RUY_TAG="97ebb72aa0655c0af98896b317476a5d0dacad9c"
+readonly RUY_TAG="3286a34cc8de6149ac6844107dfdffac91531e72"
 
 readonly ABSEIL_REPOSITORY="https://github.com/abseil/abseil-cpp"
-readonly ABSEIL_TAG="dc370a82467cb35066475537b797197aee3e5164"
+readonly ABSEIL_TAG="fb3621f4f897824c0dbe0615fa94543df6192f30"
 
 readonly EIGEN_REPOSITORY="https://gitlab.com/libeigen/eigen"
-readonly EIGEN_TAG="0e187141679fdb91da33249d18cb79a011c0e2ea"
+readonly EIGEN_TAG="aa6964bf3a34fd607837dd8123bc42465185c4f8"
 
 readonly NEON_2_SSE_REPOSITORY="https://github.com/intel/ARM_NEON_2_x86_SSE"
-readonly NEON_2_SSE_TAG="cef9501d1d1c47223466bf2b8cd43f3368c37773"
+readonly NEON_2_SSE_TAG="a15b489e1222b2087007546b4912e21293ea86ff"
 
 readonly FLATBUFFERS_REPOSITORY="https://github.com/google/flatbuffers"
-readonly FLATBUFFERS_TAG="48da2389205ca5fbd0d1f40ad52d9c0b8685a076"
+readonly FLATBUFFERS_TAG="7d6d99c6befa635780a4e944d37ebfd58e68a108"
 
 readonly GEMMLOWP_REPOSITORY="https://github.com/google/gemmlowp"
-readonly GEMMLOWP_TAG="08e4bb339e34017a0835269d4a37c4ea04d15a69"
+readonly GEMMLOWP_TAG="16e8662c34917be0065110bfcd9cc27d30f52fdf"
 
 readonly ML_DTYPES_REPOSITORY="https://github.com/jax-ml/ml_dtypes"
-readonly ML_DTYPES_TAG="780b6d0ee01ffbfac45f7ec5418bc08f2b166483"
+readonly ML_DTYPES_TAG="2ca30a2b3c0744625ae3d6988f5596740080bbd0"
+
+readonly PTHREADPOOL_REPOSITORY="https://github.com/Maratyszcza/pthreadpool"
+readonly PTHREADPOOL_TAG="4fe0e1e183925bf8cfa6aae24237e724a96479b8"
 
 readonly TENSORFLOW_REPOSITORY="https://github.com/tensorflow/tensorflow"
-readonly TENSORFLOW_TAG="b1bf09989871721a23f936617a97bb60b3d27a58"
+readonly TENSORFLOW_TAG="v2.16.1"
 
 # cpuinfo
 git clone --filter=tree:0 --no-checkout ${CPUINFO_REPOSITORY} cpuinfo/src/cpuinfo
 git -C cpuinfo/src/cpuinfo checkout ${CPUINFO_TAG}
 cmake -GNinja -S cpuinfo/src/cpuinfo -B cpuinfo/src/cpuinfo-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_FIND_PACKAGE_PREFER_CONFIG:BOOL=ON \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/cpuinfo \
   -DCMAKE_INSTALL_LIBDIR=lib \
@@ -60,6 +72,7 @@ ninja -C cpuinfo/src/cpuinfo-build install
 git clone --filter=tree:0 --no-checkout ${RUY_REPOSITORY} ruy/src/ruy
 git -C ruy/src/ruy checkout ${RUY_TAG}
 cmake -GNinja -S ruy/src/ruy -B ruy/src/ruy-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_FIND_PACKAGE_PREFER_CONFIG:BOOL=ON \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/ruy \
   -DCMAKE_INSTALL_LIBDIR=lib \
@@ -74,6 +87,7 @@ ninja -C ruy/src/ruy-build install
 git clone --filter=tree:0 --no-checkout ${ABSEIL_REPOSITORY} abseil-cpp/src/abseil-cpp
 git -C abseil-cpp/src/abseil-cpp checkout ${ABSEIL_TAG}
 cmake -GNinja -S abseil-cpp/src/abseil-cpp -B abseil-cpp/src/abseil-cpp-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_FIND_PACKAGE_PREFER_CONFIG:BOOL=ON \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/abseil-cpp \
   -DCMAKE_INSTALL_LIBDIR=lib \
@@ -86,6 +100,7 @@ ninja -C abseil-cpp/src/abseil-cpp-build install
 git clone --filter=tree:0 --no-checkout ${EIGEN_REPOSITORY} eigen/src/eigen
 git -C eigen/src/eigen checkout ${EIGEN_TAG}
 cmake -GNinja -S eigen/src/eigen -B eigen/src/eigen-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_FIND_PACKAGE_PREFER_CONFIG:BOOL=ON \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/eigen \
   -DCMAKE_INSTALL_LIBDIR=lib \
@@ -98,6 +113,7 @@ ninja -C eigen/src/eigen-build install
 git clone --filter=tree:0 --no-checkout ${NEON_2_SSE_REPOSITORY} ARM_NEON_2_x86_SSE/src/ARM_NEON_2_x86_SSE
 git -C ARM_NEON_2_x86_SSE/src/ARM_NEON_2_x86_SSE checkout ${NEON_2_SSE_TAG}
 cmake -GNinja -S ARM_NEON_2_x86_SSE/src/ARM_NEON_2_x86_SSE -B ARM_NEON_2_x86_SSE/src/ARM_NEON_2_x86_SSE-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_FIND_PACKAGE_PREFER_CONFIG:BOOL=ON \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/ARM_NEON_2_x86_SSE \
   -DCMAKE_INSTALL_LIBDIR=lib \
@@ -108,6 +124,7 @@ ninja -C ARM_NEON_2_x86_SSE/src/ARM_NEON_2_x86_SSE-build install
 git clone --filter=tree:0 --no-checkout ${FLATBUFFERS_REPOSITORY} flatbuffers/src/flatbuffers
 git -C flatbuffers/src/flatbuffers checkout ${FLATBUFFERS_TAG}
 cmake -GNinja -S flatbuffers/src/flatbuffers -B flatbuffers/src/flatbuffers-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_FIND_PACKAGE_PREFER_CONFIG:BOOL=ON \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/flatbuffers \
   -DCMAKE_INSTALL_LIBDIR=lib \
@@ -119,6 +136,7 @@ ninja -C flatbuffers/src/flatbuffers-build install
 git clone --filter=tree:0 --no-checkout ${GEMMLOWP_REPOSITORY} gemmlowp/src/gemmlowp
 git -C gemmlowp/src/gemmlowp checkout ${GEMMLOWP_TAG}
 cmake -GNinja -S gemmlowp/src/gemmlowp/contrib -B gemmlowp/src/gemmlowp-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/gemmlowp \
   -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON
 ninja -C gemmlowp/src/gemmlowp-build install
@@ -127,10 +145,30 @@ ninja -C gemmlowp/src/gemmlowp-build install
 git clone --filter=tree:0 --no-checkout ${ML_DTYPES_REPOSITORY} ml_dtypes/src/ml_dtypes
 git -C ml_dtypes/src/ml_dtypes checkout ${ML_DTYPES_TAG}
 
+# pthreadpool
+# NOTE: currently a hack, because pthreadpool doesn't support find_package.
+# we install in the default install dir, which really means the script must be run
+# under sudo. Works for buildbots. Not ideal elsewhere.
+if [[ -z "${TFLITE_SYSROOT}" ]]; then
+  PTHREADPOOL_INSTALL_PREFIX="/usr/local"
+else
+  PTHREADPOOL_INSTALL_PREFIX="${TFLITE_SYSROOT}"
+fi
+git clone --filter=tree:0 --no-checkout ${PTHREADPOOL_REPOSITORY} pthreadpool/src/pthreadpool
+git -C pthreadpool/src/pthreadpool checkout ${PTHREADPOOL_TAG}
+cmake -GNinja -S pthreadpool/src/pthreadpool -B pthreadpool/src/pthreadpool-build \
+  ${EXTRA_CMAKE_FLAGS} \
+  -DCMAKE_INSTALL_PREFIX:PATH=${PTHREADPOOL_INSTALL_PREFIX} \
+  -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON \
+  -DPTHREADPOOL_BUILD_TESTS:BOOL=OFF \
+  -DPTHREADPOOL_BUILD_BENCHMARKS:BOOL=OFF
+ninja -C pthreadpool/src/pthreadpool-build install
+
 # tflite
 git clone --filter=tree:0 --no-checkout ${TENSORFLOW_REPOSITORY} tensorflow/src/tensorflow
 git -C tensorflow/src/tensorflow checkout ${TENSORFLOW_TAG}
 cmake -GNinja -S tensorflow/src/tensorflow/tensorflow/lite -B tensorflow/src/tensorflow-build \
+  ${EXTRA_CMAKE_FLAGS} \
   -DCMAKE_FIND_PACKAGE_PREFER_CONFIG:BOOL=ON \
   -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/tensorflow \
   -DCMAKE_INSTALL_LIBDIR=lib \