--- thc-ipv6-2.1/Makefile
+++ thc-ipv6-2.1/Makefile
@@ -4,7 +4,7 @@
 
 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
@@ -17,10 +17,10 @@
 all:	$(LIBS) $(PROGRAMS) dnssecwalk dnsdict6 thcping6
 
 dnssecwalk:	dnssecwalk.c
-	$(CC) $(CFLAGS) -o $@ $^
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 
 dnsdict6:	dnsdict6.c
-	$(CC) $(CFLAGS) -o $@ $^ -lpthread -lresolv
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS) -lpthread -lresolv
 
 thcping6:	thcping6.c $(LIBS)
 	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS) -lrt