diff -Naur grpc-1.37.0-original/cmake/xxhash.cmake grpc-1.37.0/cmake/xxhash.cmake

--- grpc-1.37.0-original/cmake/xxhash.cmake	2021-04-06 18:48:56.000000000 -0400

+++ grpc-1.37.0/cmake/xxhash.cmake	2021-04-08 15:57:39.157042527 -0400

@@ -12,4 +12,6 @@

 # See the License for the specific language governing permissions and

 # limitations under the License.

-set(_gRPC_XXHASH_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/third_party/xxhash")

+pkg_search_module(XXHASH REQUIRED libxxhash)

+set(_gRPC_XXHASH_INCLUDE_DIR "${XXHASH_INCLUDEDIR}")

+set(_gRPC_XXHASH_LIBRARIES "${XXHASH_LIBRARIES}")

diff -Naur grpc-1.37.0-original/CMakeLists.txt grpc-1.37.0/CMakeLists.txt

--- grpc-1.37.0-original/CMakeLists.txt	2021-04-06 18:48:56.000000000 -0400

+++ grpc-1.37.0/CMakeLists.txt	2021-04-08 15:53:39.462854440 -0400

@@ -262,7 +262,8 @@

 elseif(_gRPC_PLATFORM_ANDROID)

   set(_gRPC_ALLTARGETS_LIBRARIES ${CMAKE_DL_LIBS} m)

 elseif(UNIX)

-  set(_gRPC_ALLTARGETS_LIBRARIES ${CMAKE_DL_LIBS} rt m pthread)

+  set(_gRPC_ALLTARGETS_LIBRARIES

+      ${CMAKE_DL_LIBS} rt m pthread ${_gRPC_XXHASH_LIBRARIES})

 endif()

 if(WIN32)