$NetBSD: patch-aa,v 1.17 2016/12/18 11:11:28 hans Exp $

Exclude -flto for gcc 4.1.3 (used in NetBSD/vax 6)
Exclude -flto for gcc 4.4.7 (Used in DragonFly 2.13 - 3.1)
Make -O2 conditional so can be overridden by environment

--- makefile.orig	2012-04-23 16:28:04.000000000 +0000
+++ makefile
@@ -187,7 +187,7 @@ ifeq ($(WIN32),)  #*nix Environments (&&
       endif
     endif
   endif
-  LTO_EXCLUDE_VERSIONS = 
+  LTO_EXCLUDE_VERSIONS = 4.1.3 4.4.7 4.8.3 4.8.4 4.8.5 5.3.0 5.4.0
   PCAPLIB = pcap
   ifeq (agcc,$(findstring agcc,$(GCC))) # Android target build?
     OS_CCDEFS = -D_GNU_SOURCE
@@ -903,11 +903,11 @@ ifneq (,$(UNSUPPORTED_BUILD))
 endif
 ifneq ($(DEBUG),)
   CFLAGS_G = -g -ggdb -g3
-  CFLAGS_O = -O0
+  CFLAGS_O ?= -O0
   BUILD_FEATURES = - debugging support
 else
   ifneq (clang,$(findstring clang,$(COMPILER_NAME)))
-    CFLAGS_O = -O2
+    CFLAGS_O ?= -O2
     ifeq (Darwin,$(OSTYPE))
       NO_LTO = 1
     endif
@@ -916,7 +916,7 @@ else
     ifeq (Darwin,$(OSTYPE))
       CFLAGS_O += -O4 -fno-strict-overflow -flto -fwhole-program
     else
-      CFLAGS_O := -O2 -fno-strict-overflow 
+      CFLAGS_O ?= -O2 -fno-strict-overflow 
     endif
   endif
   LDFLAGS_O = 
