diff --git a/emu/Makefile b/emu/Makefile
index 19abbb2..37b9d06 100644
--- a/emu/Makefile
+++ b/emu/Makefile
@@ -3,7 +3,8 @@ H=pdp6.h ../tools/pdp6common.h threading.h
 # clang
 #CFLAGS= -Wno-shift-op-parentheses -Wno-logical-op-parentheses \
 #        -Wno-bitwise-op-parentheses
-CFLAGS= -g -O3 -Wall -Wno-parentheses -fno-diagnostics-show-caret
+#GCCFLAGS=-fno-diagnostics-show-caret
+CFLAGS= -g -O3 -Wall -Wno-parentheses $(GCCFLAGS)
 #CFLAGS= -g -Wall -Wno-parentheses -fno-diagnostics-show-caret
 SDLFLAGS=`sdl2-config --cflags` `pkg-config SDL2_image --cflags` -DGRAPHICS