--- 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