diff --git a/common.cpp b/common.cpp
index ba746d4..c390cbf 100644
--- a/common.cpp
+++ b/common.cpp
@@ -93,20 +93,19 @@ inline int is_big_endian()
 }
 u64_t ntoh64(u64_t a)
 {
-	static int big_endian=is_big_endian();
-	if(!big_endian)
-	{
+	#ifdef UDP2RAW_BIG_ENDIAN
 		u32_t h=get_u64_h(a);
 		u32_t l=get_u64_l(a);
 		return pack_u64(ntohl(l),ntohl(h));
 		//return bswap_64( a);
-	}
-	else return a;
+	#else
+	return a;
+	#endif
 
 }
 u64_t hton64(u64_t a)
 {
-	return ntoh64(u64_t a);
+	return ntoh64(a);
 }
 
 void setnonblocking(int sock) {
@@ -131,9 +130,9 @@ void setnonblocking(int sock) {
     Generic checksum calculation function
 */
 unsigned short csum(const unsigned short *ptr,int nbytes) {//works both for big and little endian
-    register long sum;
+    long sum;
     unsigned short oddbyte;
-    register short answer;
+    short answer;
 
     sum=0;
     while(nbytes>1) {
diff --git a/common.h b/common.h
index 50b281f..4edd884 100644
--- a/common.h
+++ b/common.h
@@ -61,6 +61,25 @@
 #include <set>
 using  namespace std;
 
+#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN || \
+    defined(__BIG_ENDIAN__) || \
+    defined(__ARMEB__) || \
+    defined(__THUMBEB__) || \
+    defined(__AARCH64EB__) || \
+    defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__)
+#define UDP2RAW_BIG_ENDIAN 1
+#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN || \
+    defined(__LITTLE_ENDIAN__) || \
+    defined(__ARMEL__) || \
+    defined(__THUMBEL__) || \
+    defined(__AARCH64EL__) || \
+    defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__)
+#define UDP2RAW_LITTLE_ENDIAN 1
+// It's a little-endian target architecture
+#else
+#error "I don't know what architecture this is!"
+#endif
+
 
 typedef unsigned long long u64_t;   //this works on most platform,avoid using the PRId64
 typedef long long i64_t;
diff --git a/lib/aes.c b/lib/aes.cpp
similarity index 100%
rename from lib/aes.c
rename to lib/aes.cpp
diff --git a/lib/aes_faster_c/aes.c b/lib/aes_faster_c/aes.cpp
similarity index 100%
rename from lib/aes_faster_c/aes.c
rename to lib/aes_faster_c/aes.cpp
diff --git a/lib/aes_faster_c/wrapper.c b/lib/aes_faster_c/wrapper.cpp
similarity index 100%
rename from lib/aes_faster_c/wrapper.c
rename to lib/aes_faster_c/wrapper.cpp
diff --git a/lib/md5.c b/lib/md5.cpp
similarity index 100%
rename from lib/md5.c
rename to lib/md5.cpp
diff --git a/lib/sha1.c b/lib/sha1.cpp
similarity index 100%
rename from lib/sha1.c
rename to lib/sha1.cpp
diff --git a/makefile b/makefile
index 859a6f4..7733551 100755
--- a/makefile
+++ b/makefile
@@ -10,10 +10,10 @@ cc_arm= /toolchains/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 #cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
 FLAGS= -std=c++11 -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers ${OPT}
 
-COMMON=main.cpp lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp  connection.cpp misc.cpp fd_manager.cpp -lpthread my_ev.cpp -isystem libev -lpcap -D_DEFAULT_SOURCE `libnet-config --defines` `libnet-config --libs` 
+COMMON=main.cpp lib/md5.cpp encrypt.cpp log.cpp network.cpp common.cpp  connection.cpp misc.cpp fd_manager.cpp -lpthread my_ev.cpp -isystem libev -lpcap -D_DEFAULT_SOURCE `libnet-config --defines` `libnet-config --libs` 
 
-SOURCES= $(COMMON) lib/aes_faster_c/aes.c lib/aes_faster_c/wrapper.c
-SOURCES_TINY_AES= $(COMMON) lib/aes.c
+SOURCES= $(COMMON) lib/aes_faster_c/aes.cpp lib/aes_faster_c/wrapper.cpp
+SOURCES_TINY_AES= $(COMMON) lib/aes.cpp
 SOURCES_AES_ACC=$(COMMON) $(wildcard lib/aes_acc/aes*.c)
 
 NAME=udp2raw
@@ -23,6 +23,9 @@ TAR=${NAME}_binaries.tar.gz `echo ${TARGETS}|sed -r 's/([^ ]+)/udp2raw_\1/g'` ve
 all:git_version
 	rm -f ${NAME}
 	${cc_local}   -o ${NAME}          -I. ${SOURCES} ${FLAGS} -lrt -ggdb -static -O3
+mac:git_version
+	rm -f ${NAME}
+	${cc_local}   -o ${NAME}          -I. ${SOURCES} ${FLAGS} -ggdb -O2
 fast: git_version
 	rm -f ${NAME}
 	${cc_local}   -o ${NAME}          -I. ${SOURCES} ${FLAGS} -lrt -ggdb
diff --git a/network.cpp b/network.cpp
index 6db3832..cd76a7e 100644
--- a/network.cpp
+++ b/network.cpp
@@ -2060,7 +2060,7 @@ int try_to_list_and_bind(int &fd,u32_t local_ip_uint32,int port)  //try to bind
      temp_bind_addr.sin_port = htons(port);
      temp_bind_addr.sin_addr.s_addr = local_ip_uint32;
 
-     if (bind(fd, (struct sockaddr*)&temp_bind_addr, sizeof(temp_bind_addr)) !=0)
+     if (::bind(fd, (struct sockaddr*)&temp_bind_addr, sizeof(temp_bind_addr)) !=0)
      {
     	 mylog(log_debug,"bind fail\n");
     	 return -1;
diff --git a/network.h b/network.h
index 1cae436..c922d6b 100644
--- a/network.h
+++ b/network.h
@@ -50,15 +50,13 @@ struct icmphdr
 
 struct my_iphdr
   {
-//#if __BYTE_ORDER == __LITTLE_ENDIAN
+#ifdef UDP2RAW_LITTLE_ENDIAN
     unsigned int ihl:4;
     unsigned int version:4;
-//#elif __BYTE_ORDER == __BIG_ENDIAN
-//    unsigned int version:4;
-//    unsigned int ihl:4;
-//#else
-//# error	"Please fix <bits/endian.h>"
-//#endif
+#else
+    unsigned int version:4;
+    unsigned int ihl:4;
+#endif
     u_int8_t tos;
     u_int16_t tot_len;
     u_int16_t id;
@@ -74,7 +72,7 @@ struct my_iphdr
 
 struct my_udphdr
 {
-  __extension__ union
+  /*__extension__*/ union
   {
     struct
     {
@@ -96,7 +94,7 @@ struct my_udphdr
 
 struct my_tcphdr
   {
-    __extension__ union
+    /*__extension__*/ union
     {
       struct
       {
@@ -104,14 +102,13 @@ struct my_tcphdr
 	u_int16_t th_dport;		/* destination port */
 	u_int32_t th_seq;		/* sequence number */
 	u_int32_t th_ack;		/* acknowledgement number */
-//# if __BYTE_ORDER == __LITTLE_ENDIAN
+# ifdef UDP2RAW_LITTLE_ENDIAN
 	u_int8_t th_x2:4;		/* (unused) */
+	u_int8_t tc_off:4;		/* data offset */
+# else
 	u_int8_t th_off:4;		/* data offset */
-//# endif
-//# if __BYTE_ORDER == __BIG_ENDIAN
-//	u_int8_t th_off:4;		/* data offset */
-//	u_int8_t th_x2:4;		/* (unused) */
-//# endif
+	u_int8_t th_x2:4;		/* (unused) */
+# endif
 	u_int8_t th_flags;
 # define TH_FIN	0x01
 # define TH_SYN	0x02
@@ -129,7 +126,7 @@ struct my_tcphdr
 	u_int16_t dest;
 	u_int32_t seq;
 	u_int32_t ack_seq;
-//# if __BYTE_ORDER == __LITTLE_ENDIAN
+# ifdef UDP2RAW_LITTLE_ENDIAN
 	u_int16_t res1:4;
 	u_int16_t doff:4;
 	u_int16_t fin:1;
@@ -139,19 +136,17 @@ struct my_tcphdr
 	u_int16_t ack:1;
 	u_int16_t urg:1;
 	u_int16_t res2:2;
-//# elif __BYTE_ORDER == __BIG_ENDIAN
-//	u_int16_t doff:4;
-//	u_int16_t res1:4;
-//	u_int16_t res2:2;
-//	u_int16_t urg:1;
-//	u_int16_t ack:1;
-//	u_int16_t psh:1;
-//	u_int16_t rst:1;
-//	u_int16_t syn:1;
-//	u_int16_t fin:1;
-//# else
-//#  error "Adjust your <bits/endian.h> defines"
-//# endif
+# else
+	u_int16_t doff:4;
+	u_int16_t res1:4;
+	u_int16_t res2:2;
+	u_int16_t urg:1;
+	u_int16_t ack:1;
+	u_int16_t psh:1;
+	u_int16_t rst:1;
+	u_int16_t syn:1;
+	u_int16_t fin:1;
+# endif
 	u_int16_t window;
 	u_int16_t check;
 	u_int16_t urg_ptr;