$NetBSD: patch-Makefile,v 1.1 2019/07/08 06:46:22 sjmulder Exp $

 - Respect existing CFLAGS by appending, rather than replacing.
 - Respect LDFLAGS
 - Remove -O3 default.

https://github.com/mist64/cbmbasic/pull/5

--- Makefile
+++ Makefile
@@ -1,10 +1,10 @@
 OBJS=cbmbasic.o runtime.o plugin.o console.o
-CFLAGS=-Wall -O3
+CFLAGS+=-Wall
 
 all: cbmbasic
 
 cbmbasic: $(OBJS)
-	$(CC) -o cbmbasic $(OBJS)
+	$(CC) $(LDFLAGS) -o cbmbasic $(OBJS)
 
 clean:
 	rm -f $(OBJS) cbmbasic