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diff --git a/cmake/FindGRPC.cmake b/cmake/FindGRPC.cmake
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+# Copyright 2018 Google
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+include(FindPackageHandleStandardArgs)
+include(FindZLIB)
+
+set(BINARY_DIR ${FIREBASE_INSTALL_DIR}/external/grpc)
+
+## ZLIB
+
+# the grpc ExternalProject already figures out if zlib should be built or
+# referenced from its installed location. If it elected to allow grpc to build
+# zlib then it will be available at this location.
+find_library(
+  ZLIB_LIBRARY
+  NAMES z
+  HINTS ${BINARY_DIR}/src/grpc-build/third_party/zlib
+)
+
+# If found above, the standard package will honor the ZLIB_LIBRARY variable.
+find_package(ZLIB REQUIRED)
+
+
+## BoringSSL/OpenSSL
+
+find_path(
+  OPENSSL_INCLUDE_DIR openssl/ssl.h
+  HINTS ${BINARY_DIR}/src/grpc/third_party/boringssl/include
+)
+
+find_library(
+  OPENSSL_SSL_LIBRARY
+  NAMES ssl
+  HINTS ${BINARY_DIR}/src/grpc-build/third_party/boringssl/ssl
+)
+
+find_library(
+  OPENSSL_CRYPTO_LIBRARY
+  NAMES crypto
+  HINTS ${BINARY_DIR}/src/grpc-build/third_party/boringssl/crypto
+)
+
+find_package(OpenSSL REQUIRED)
+
+
+## C-Ares
+
+find_library(
+  CARES_LIBRARY
+  NAMES cares
+  HINTS ${BINARY_DIR}/src/grpc-build/third_party/cares/cares/lib
+)
+if(NOT (CARES_LIBRARY STREQUAL "CARES_LIBRARY-NOTFOUND"))
+  if (NOT TARGET c-ares::ares)
+    add_library(c-ares::ares UNKNOWN IMPORTED)
+    set_target_properties(
+      c-ares::ares PROPERTIES
+      IMPORTED_LOCATION ${CARES_LIBRARY}
+    )
+  endif()
+endif()
+
+
+## GRPC
+
+find_path(
+  GRPC_INCLUDE_DIR grpc/grpc.h
+  HINTS
+    $ENV{GRPC_ROOT}/include
+    ${GRPC_ROOT}/include
+    ${BINARY_DIR}/src/grpc/include
+)
+
+find_library(
+  GPR_LIBRARY
+  NAMES gpr
+  HINTS
+    $ENV{GRPC_ROOT}/lib
+    ${GRPC_ROOT}/lib
+    ${BINARY_DIR}/src/grpc-build
+)
+
+find_library(
+  GRPC_LIBRARY
+  NAMES grpc
+  HINTS
+    $ENV{GRPC_ROOT}/lib
+    ${GRPC_ROOT}/lib
+    ${BINARY_DIR}/src/grpc-build
+)
+
+find_package_handle_standard_args(
+  gRPC
+  DEFAULT_MSG
+  GRPC_INCLUDE_DIR
+  GRPC_LIBRARY
+  GPR_LIBRARY
+)
+
+if(GRPC_FOUND)
+  set(GRPC_INCLUDE_DIRS ${GRPC_INCLUDE_DIR})
+  set(GRPC_LIBRARIES ${GRPC_LIBRARY})
+
+  if (NOT TARGET grpc::gpr)
+    add_library(grpc::gpr UNKNOWN IMPORTED)
+    set_target_properties(
+      grpc::gpr PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES ${GRPC_INCLUDE_DIR}
+      IMPORTED_LOCATION ${GPR_LIBRARY}
+    )
+  endif()
+
+  if (NOT TARGET grpc::grpc)
+    set(
+      GRPC_LINK_LIBRARIES
+      c-ares::ares
+      grpc::gpr
+      OpenSSL::SSL
+      OpenSSL::Crypto
+      ZLIB::ZLIB
+    )
+
+    add_library(grpc::grpc UNKNOWN IMPORTED)
+    set_target_properties(
+      grpc::grpc PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES ${GRPC_INCLUDE_DIR}
+      INTERFACE_LINK_LIBRARIES "${GRPC_LINK_LIBRARIES}"
+      IMPORTED_LOCATION ${GRPC_LIBRARY}
+    )
+  endif()
+endif(GRPC_FOUND)