$NetBSD: patch-Makefile,v 1.1 2018/08/13 14:37:25 nia Exp $

Honour CFLAGS/LDFLAGS.

--- Makefile.orig	2018-08-03 19:45:52.000000000 +0000
+++ Makefile
@@ -32,7 +32,7 @@ sfc_lagfix := 1
 ifeq ($(DEBUG), 1)
   flags := -I. -O0 -g
 else
-  flags := -I. -O3 -fomit-frame-pointer
+  flags := -I.
 endif
 
 cflags := $(CPPFLAGS) $(CFLAGS) -std=gnu99 -xc
@@ -146,3 +146,4 @@ ifneq ($(lto),)
   flags += -flto
   link += $(flags)
 endif
+link += $(LDFLAGS)