Makefile.patch

diff --git a/examples/cpp/helloworld/Makefile b/examples/cpp/helloworld/Makefile
index 9af7337..c46c525 100644
--- a/examples/cpp/helloworld/Makefile
+++ b/examples/cpp/helloworld/Makefile
@@ -16,8 +16,8 @@
 
 HOST_SYSTEM = $(shell uname | cut -f 1 -d_)
 SYSTEM ?= $(HOST_SYSTEM)
-CXX = g++
-CPPFLAGS += `pkg-config --cflags protobuf grpc`
+CXX = occlum-g++
+CPPFLAGS += -I/usr/local/occlum/x86_64-linux-musl/include
 CXXFLAGS += -std=c++11
 ifeq ($(SYSTEM),Darwin)
 LDFLAGS += -L/usr/local/lib `pkg-config --libs protobuf grpc++ grpc`\
@@ -25,7 +25,8 @@ LDFLAGS += -L/usr/local/lib `pkg-config --libs protobuf grpc++ grpc`\
            -lgrpc++_reflection\
            -ldl
 else
-LDFLAGS += -L/usr/local/lib `pkg-config --libs protobuf grpc++ grpc`\
+LDFLAGS += -L/usr/local/occlum/x86_64-linux-musl/lib -lgrpc++ -lgrpc -lprotobuf -lgpr \
+           -lcares -lz -laddress_sorting -pie\
            -pthread\
            -Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed\
            -ldl
@@ -34,7 +35,7 @@ PROTOC = protoc
 GRPC_CPP_PLUGIN = grpc_cpp_plugin
 GRPC_CPP_PLUGIN_PATH ?= `which $(GRPC_CPP_PLUGIN)`
 
-PROTOS_PATH = ../../protos
+PROTOS_PATH = .
 
 vpath %.proto $(PROTOS_PATH)