diff -Npur grpc/CMakeLists.txt grpc-patch/CMakeLists.txt
--- grpc/CMakeLists.txt	2020-02-27 03:12:33.000000000 +0800
+++ grpc-patch/CMakeLists.txt	2021-04-07 21:27:12.317207600 +0800
@@ -12992,7 +12992,7 @@ if(gRPC_BUILD_CODEGEN AND gRPC_BUILD_GRP
 add_executable(grpc_cpp_plugin
   src/compiler/cpp_plugin.cc
 )
-
+set_target_properties(grpc_cpp_plugin PROPERTIES INSTALL_RPATH $ORIGIN/../lib)
 target_include_directories(grpc_cpp_plugin
   PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}
diff -Npur grpc/cmake/cares.cmake grpc-patch/cmake/cares.cmake
--- grpc/cmake/cares.cmake	2020-02-27 03:12:33.000000000 +0800
+++ grpc-patch/cmake/cares.cmake	2021-04-10 14:22:35.895725700 +0800
@@ -39,7 +39,7 @@ if(gRPC_CARES_PROVIDER STREQUAL "module"
     set(gRPC_INSTALL FALSE)
   endif()
 elseif(gRPC_CARES_PROVIDER STREQUAL "package")
-  find_package(c-ares 1.13.0 REQUIRED)
+  find_package(c-ares REQUIRED) # cmake 3.19+ cannot find cares 1.15.0
   if(TARGET c-ares::cares)
     set(_gRPC_CARES_LIBRARIES c-ares::cares)
   endif()