diff -urN thc-ipv6-2.7/Makefile thc-ipv6-2.7.new/Makefile
--- thc-ipv6-2.7/Makefile	2014-12-27 05:05:30.000000000 -0800
+++ thc-ipv6-2.7.new/Makefile	2017-02-04 20:55:51.679898101 -0800
@@ -3,7 +3,7 @@
 
 CC=gcc
 #CFLAGS=-g
-CFLAGS=-O2
+CFLAGS?=-O2
 CFLAGS+=$(if $(HAVE_SSL),-D_HAVE_SSL,)
 LDFLAGS+=-lpcap $(if $(HAVE_SSL),-lssl -lcrypto,)
 PROGRAMS=parasite6 dos-new-ip6 detect-new-ip6 fake_router6 fake_advertise6 fake_solicitate6 fake_mld6 fake_mld26 fake_mldrouter6 flood_mldrouter6 fake_mipv6 redir6 smurf6 alive6 toobig6 rsmurf6 implementation6 implementation6d sendpees6 sendpeesmp6 randicmp6 fuzz_ip6 flood_mld6 flood_mld26 flood_router6 flood_advertise6 flood_solicitate6 trace6 exploit6 denial6 fake_dhcps6 flood_dhcpc6 fake_dns6d fragmentation6 kill_router6 fake_dnsupdate6 ndpexhaust6 detect_sniffer6 dump_router6 fake_router26 flood_router26 passive_discovery6 dnsrevenum6 inverse_lookup6 node_query6 address6 covert_send6 covert_send6d inject_alive6 firewall6 ndpexhaust26 fake_pim6 thcsyn6 redirsniff6 flood_redir6 four2six dump_dhcp6 fuzz_dhcps6 flood_rs6 fuzz_dhcpc6
