diff --git a/lib/blacklist.h b/lib/blacklist.h
index 5604171..80a44fc 100644
--- a/lib/blacklist.h
+++ b/lib/blacklist.h
@@ -1,7 +1,7 @@
 #include <stdint.h>
 
-#ifndef _BLACKLIST_H
-#define _BLACKLIST_H
+#ifndef BLACKLIST_H
+#define BLACKLIST_H
 
 int blacklist_is_allowed(uint32_t s_addr);
 void blacklist_prefix(char *ip, int prefix_len);
diff --git a/lib/constraint.h b/lib/constraint.h
index 3e914a3..2170f8f 100644
--- a/lib/constraint.h
+++ b/lib/constraint.h
@@ -1,5 +1,5 @@
-#ifndef _CONSTRAINT_H
-#define _CONSTRAINT_H
+#ifndef CONSTRAINT_H
+#define CONSTRAINT_H
 
 typedef struct _constraint constraint_t;
 typedef int value_t;
diff --git a/lib/logger.h b/lib/logger.h
index 8cf2a9f..a961ac3 100644
--- a/lib/logger.h
+++ b/lib/logger.h
@@ -1,8 +1,8 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-#ifndef _LOGGER_H
-#define _LOGGER_H
+#ifndef LOGGER_H
+#define LOGGER_H
 
 enum LogLevel { LOG_FATAL, LOG_ERROR, LOG_WARN, LOG_INFO, LOG_DEBUG, LOG_TRACE,
 					NUM_LOGLEVELS };
diff --git a/lib/random.h b/lib/random.h
index d83b14d..b05a5d6 100644
--- a/lib/random.h
+++ b/lib/random.h
@@ -1,8 +1,8 @@
 #include <stdlib.h>
 #include <stdint.h>
 
-#ifndef _RANDOM_H
-#define _RANDOM_H
+#ifndef RANDOM_H
+#define RANDOM_H
 
 int random_bytes(void *dst, size_t n);
 
diff --git a/lib/redis.h b/lib/redis.h
index 51a1a7f..229136c 100644
--- a/lib/redis.h
+++ b/lib/redis.h
@@ -2,8 +2,8 @@
 #include <unistd.h>
 #include <hiredis/hiredis.h>
 
-#ifndef _REDIS_ZHELPERS_H
-#define _REDIS_ZHELPERS_H
+#ifndef REDIS_ZHELPERS_H
+#define REDIS_ZHELPERS_H
 
 int redis_init(void);
 
diff --git a/lib/rijndael-alg-fst.h b/lib/rijndael-alg-fst.h
index 2c3396e..4a8bd5a 100644
--- a/lib/rijndael-alg-fst.h
+++ b/lib/rijndael-alg-fst.h
@@ -23,8 +23,8 @@
  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-#ifndef __RIJNDAEL_ALG_FST_H
-#define __RIJNDAEL_ALG_FST_H
+#ifndef RIJNDAEL_ALG_FST_H
+#define RIJNDAEL_ALG_FST_H
 
 #define MAXKC	(256/32)
 #define MAXKB	(256/8)
@@ -44,4 +44,4 @@ void rijndaelEncryptRound(const u32 rk[/*4*(Nr + 1)*/], int Nr, u8 block[16], in
 void rijndaelDecryptRound(const u32 rk[/*4*(Nr + 1)*/], int Nr, u8 block[16], int rounds);
 #endif /* INTERMEDIATE_VALUE_KAT */
 
-#endif /* __RIJNDAEL_ALG_FST_H */
+#endif /* RIJNDAEL_ALG_FST_H */
diff --git a/src/Makefile b/src/Makefile
index 1ae5e35..6f9f98f 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,44 +1,43 @@
-CFLAGS+=-Wall -pedantic -Wextra -std=gnu99 -I../lib -I./ -Ioutput_modules -O2 -g
-LDFLAGS+=-g -pthread
-LDLIBS+= -lpcap -lgmp -lm
+INCLUDE+=-I../lib -I./ -Ioutput_modules
+LDFLAGS+=-pthread
+LDLIBS+=-lpcap -lgmp -lm
 TARGETS=zmap
 VPATH=../lib:output_modules:probe_modules
 PREFIX=/usr/local
 
 INSTALL=install
 INSTALLDATA=install -m 644
-mandir=/usr/share/man/man1/
+mandir=$(PREFIX)/man/man1/
 bindir=$(PREFIX)/sbin
 
 # Hardening and warnings for building with gcc
-#M aybe add -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
-#-Wold-style-definition -Wswitch-enum 
-GCCWARNINGS = -Wall -fno-strict-aliasing -W -Wfloat-equal -Wundef      \
--Wpointer-arith														   \
--Wwrite-strings -Wredundant-decls -Wchar-subscripts -Wcomment          \
--Wformat=2 -Wwrite-strings -Wredundant-decls -Wno-unused-but-set-variable    \
+# Maybe add -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
+GCCWARNINGS = -Wall -Wformat=2 -Wno-format-nonliteral\
+-pedantic -fno-strict-aliasing \
+-Wextra \
+-Wfloat-equal -Wundef -Wwrite-strings -Wredundant-decls  \
 -Wnested-externs -Wbad-function-cast -Winit-self         \
--Wmissing-field-initializers										   \
--Waddress -Wmissing-noreturn -Wnormalized=id    \
--Woverride-init -Wstrict-overflow=1 -Wextra -Warray-bounds             \
--Wstack-protector -Wformat -Wformat-security -Wpointer-sign -Wno-format-nonliteral -Wno-format-y2k
-GCCHARDENING=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fwrapv -fPIC --param ssp-buffer-size=1
+-Wmissing-noreturn -Wnormalized=id    \
+-Wstack-protector
+
+GCCHARDENING=-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all -fwrapv -fPIC --param ssp-buffer-size=1
 LDHARDENING=-z relro -z now
 
-EXTRACFLAGS=-g -O2 $(EXTRA_CFLAGS) $(GCCHARDENING) $(GCCWARNINGS) -Werror
+EXTRACFLAGS=-std=gnu99 -g -O2 $(GCCHARDENING) $(GCCWARNINGS) $(EXTRA_CFLAGS) -Werror
 EXTRALDFLAGS= $(LDHARDENING)
 
-CFLAGS+=-Wall $(INCLUDE) $(EXTRACFLAGS)
+CFLAGS+=$(INCLUDE) $(EXTRACFLAGS)
 LDFLAGS+=$(EXTRALDFLAGS)
 
 probemodules=module_tcp_synscan.o module_icmp_echo.o #module_udp.o #ADD YOUR PROBE MODULE HERE
-outputmodules= module_csv.o #module_simple_file.o module_extended_file.o module_csv.o #ADD YOUR OUTPUT MODULE HERE
+outputmodules= module_csv.o #ADD YOUR OUTPUT MODULE HERE
 
-objects=constraint.o blacklist.o cyclic.o logger.o send.o recv.o state.o monitor.o zopt.o zmap.o random.o output_modules.o packet.o probe_modules.o ${probemodules} ${outputmodules} validate.o rijndael-alg-fst.o get_gateway.o aesrand.o fieldset.o
+objects=constraint.o blacklist.o cyclic.o logger.o send.o recv.o state.o monitor.o zopt_compat.o zmap.o random.o output_modules.o packet.o probe_modules.o ${probemodules} ${outputmodules} validate.o rijndael-alg-fst.o get_gateway.o aesrand.o fieldset.o
+redis_objects=module_redis.o redis.o
 
 ifeq ($(REDIS), true)
 	LDLIBS+=-lhiredis
-	objects+=module_redis.o redis.o
+	objects+=$(redis_objects)
 	CFLAGS+=-DREDIS
 endif
 
@@ -49,17 +48,20 @@ $(TARGETS):
 
 zmap: $(objects) 
 
+zopt_compat.o: zopt.c
+
 zopt.c zopt.h: zopt.ggo
 	gengetopt -C --no-help --no-version -i $^ -F $*
 
 install: zmap
 	$(INSTALL) zmap $(bindir)/zmap
 	test -d /etc/zmap || (mkdir /etc/zmap && $(INSTALLDATA) ../conf/* /etc/zmap/)
+	test -d $(mandir) || mkdir -p $(mandir)
 	$(INSTALLDATA) ./zmap.1 $(mandir)
-	echo "\n\n\n\n**************\nSuccess! ZMap is installed. Try running (as root):\nzmap -p 80 -N 10 -B 1M -o -\n**************"
+	@echo "\n**************\nSuccess! ZMap is installed. Try running (as root):\nzmap -p 80 -N 10 -B 1M -o -\n**************"
 
 clean:
-	-rm -f $(objects) $(TARGETS)
+	-rm -f $(objects) $(redis_objects) $(TARGETS)
 
 .PHONY: install clean
 
diff --git a/src/aesrand.h b/src/aesrand.h
index 2d3dedb..352c14a 100644
--- a/src/aesrand.h
+++ b/src/aesrand.h
@@ -8,8 +8,8 @@
 
 #include <stdint.h>
 
-#ifndef _AESRAND_H
-#define _AESRAND_H
+#ifndef AESRAND_H
+#define AESRAND_H
 
 void aesrand_init(uint32_t seed);
 
diff --git a/src/cyclic.h b/src/cyclic.h
index f7bb7a2..f7f7387 100644
--- a/src/cyclic.h
+++ b/src/cyclic.h
@@ -8,8 +8,8 @@
 
 #include <stdint.h>
 
-#ifndef _CYCLIC_H
-#define _CYCLIC_H
+#ifndef CYCLIC_H
+#define CYCLIC_H
 
 int cyclic_init(uint32_t, uint32_t);
 
diff --git a/src/get_gateway.h b/src/get_gateway.h
index 398e3e1..ba5098b 100644
--- a/src/get_gateway.h
+++ b/src/get_gateway.h
@@ -6,8 +6,8 @@
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
  */
 
-#ifndef _GET_GATEWAY_H
-#define _GET_GATEWAY_H
+#ifndef GET_GATEWAY_H
+#define GET_GATEWAY_H
 
 #include <netinet/in.h>
 
diff --git a/src/monitor.h b/src/monitor.h
index c8bd9fb..9dcc673 100644
--- a/src/monitor.h
+++ b/src/monitor.h
@@ -6,8 +6,8 @@
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
  */
 
-#ifndef _MONITOR_H
-#define _MONITOR_H
+#ifndef MONITOR_H
+#define MONITOR_H
 
 void monitor_run();
 
diff --git a/src/output_modules/output_modules.h b/src/output_modules/output_modules.h
index 85a83ae..8da6399 100644
--- a/src/output_modules/output_modules.h
+++ b/src/output_modules/output_modules.h
@@ -6,8 +6,8 @@
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
  */
 
-#ifndef HEADER_OUTPUT_MODULES_H
-#define HEADER_OUTPUT_MODULES_H
+#ifndef OUTPUT_MODULES_H
+#define OUTPUT_MODULES_H
 
 #include "../state.h"
 #include "../fieldset.h"
diff --git a/src/probe_modules/packet.h b/src/probe_modules/packet.h
index 91fa0b6..1db5d6d 100644
--- a/src/probe_modules/packet.h
+++ b/src/probe_modules/packet.h
@@ -6,8 +6,8 @@
 #include <netinet/ip_icmp.h>
 #include <netinet/udp.h>
 
-#ifndef HEADER_ZMAP_PACKET_H
-#define HEADER_ZMAP_PACKET_H
+#ifndef PACKET_H
+#define PACKET_H
 
 #define MAX_PACKET_SIZE 4096
 
diff --git a/src/recv.h b/src/recv.h
index 8befea5..3c6f055 100644
--- a/src/recv.h
+++ b/src/recv.h
@@ -6,8 +6,8 @@
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
  */
 
-#ifndef _RECV_H
-#define _RECV_H
+#ifndef RECV_H
+#define RECV_H
 
 int recv_update_pcap_stats(void);
 int recv_run(pthread_mutex_t *recv_ready_mutex);
diff --git a/src/send.h b/src/send.h
index 5116e45..1b96120 100644
--- a/src/send.h
+++ b/src/send.h
@@ -6,8 +6,8 @@
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
  */
 
-#ifndef _SEND_H
-#define _SEND_H
+#ifndef SEND_H
+#define SEND_H
 
 int send_init(void);
 int send_run(void);
diff --git a/src/state.h b/src/state.h
index 8846008..a9f8f22 100644
--- a/src/state.h
+++ b/src/state.h
@@ -16,8 +16,8 @@
 #include "types.h"
 #include "fieldset.h"
 
-#ifndef _STATE_H
-#define _STATE_H
+#ifndef STATE_H
+#define STATE_H
 
 #define MAX_PACKET_SIZE 4096
 
diff --git a/src/validate.h b/src/validate.h
index e1b0230..4eb6362 100644
--- a/src/validate.h
+++ b/src/validate.h
@@ -6,8 +6,8 @@
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
  */
 
-#ifndef _VALIDATE_H
-#define _VALIDATE_H
+#ifndef VALIDATE_H
+#define VALIDATE_H
 
 #define VALIDATE_BYTES 16
 
diff --git a/src/zopt_compat.c b/src/zopt_compat.c
new file mode 100644
index 0000000..3dfda9d
--- /dev/null
+++ b/src/zopt_compat.c
@@ -0,0 +1,7 @@
+#if __GNUC__ < 4
+#error "gcc version >= 4 is required"
+#elif __GNUC_MINOR__ >= 6
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
+
+#include "zopt.c"