--- src/Makefile.orig	2021-03-18 09:51:03 UTC
+++ src/Makefile
@@ -67,11 +67,7 @@ SRCS_all=	\
 	${SRCS_sixelv} \
 	${SRCS_test} \
 
-CXX+=		-g
-#CXX+=		-fsanitize=undefined
-
-CPPFLAGS+=	-O0
-CPPFLAGS+=	-Wall -Werror -Wshadow -Wno-sign-compare
+CPPFLAGS+=	${CXXFLAGS} -Wall -Werror -Wshadow -Wno-sign-compare
 INCLUDES+=	-I..
 
 all:	sayaka test sixelv