--- /dev/null
+--- a/Makefile.orig 2019-03-15 03:55:48.407966162 +0000
++++ b/Makefile 2019-03-15 03:56:01.320976021 +0000
+@@ -15,10 +15,10 @@ EXTRAVERSION =
+ LOCAL_VERSION =
+ CONFIG_LOCALVERSION =
+
+-CPPFLAGS = -I libfdt -I .
++CPPFLAGS += -I libfdt -I .
+ WARNINGS = -Wall -Wpointer-arith -Wcast-qual -Wnested-externs \
+ -Wstrict-prototypes -Wmissing-prototypes -Wredundant-decls -Wshadow
+-CFLAGS = -g -Os $(SHAREDLIB_CFLAGS) -Werror $(WARNINGS)
++CFLAGS += $(SHAREDLIB_CFLAGS) -Werror $(WARNINGS)
+
+ BISON = bison
+ LEX = flex