$NetBSD$

Don't override CFLAGS.

--- Makefile.libretro.orig	2017-08-06 14:04:20.000000000 +0000
+++ Makefile.libretro
@@ -39,8 +39,7 @@ ENDIANNESS_DEFINES :=
 CORE_DIR := .
 
 ifeq ($(platform), unix)
-	CFLAGS = -g -O2 
-	CXXFLAGS = -g -O2  -fno-merge-constants 
+	CXXFLAGS += -fno-merge-constants 
 	TARGET := $(TARGET_NAME)_libretro.so
 	fpic := -fPIC
 	SHARED := -shared -Wl,--no-undefined -Wl,--version-script=link.T
@@ -121,7 +120,6 @@ OBJECTS := $(SOURCES_CXX:.cpp=.o) $(SOUR
 all: $(TARGET)
 
 ifeq ($(DEBUG), 0)
-   FLAGS += -O3 -ffast-math -fomit-frame-pointer
 else
    FLAGS += -O0 -g
 endif