diff --git a/agent/Makefile.in b/agent/Makefile.in
index d99ec78..29bdaf3 100644
--- a/agent/Makefile.in
+++ b/agent/Makefile.in
@@ -61,7 +61,7 @@
 CXXFLAGS += @CXXFLAGS@
 CXXFLAGS += $(shell pkg-config --cflags-only-I grpc++)
 CPPFLAGS += `pkg-config --cflags protobuf grpc`
-CXXFLAGS += -std=c++11
+CXXFLAGS += -std=c++11 -fpermissive -Wno-literal-suffix
 LDFLAGS += @LDFLAGS@
 LDFLAGS += `pkg-config --libs protobuf grpc++ grpc` -ldl -lgpr
 CXXFLAGSDEVICE = -I./device -I./device/$(OPENOLTDEVICE) -I./device/generic