Adding support for Mac OSX.

Compiles fine on 10.9,
$ uname -a
Darwin mikalv.local 13.1.0 Darwin Kernel Version 13.1.0: Thu Jan 16 19:40:37 PST
2014; root:xnu-2422.90.20~2/RELEASE_X86_64 x86_64

I2PEndian.h

@@ -5,11 +5,27 @@
 #include <endian.h>
 #elif __FreeBSD__
 #include <sys/endian.h>
-#elif __MACH__ // Mac OS X
-#include <machine/endian.h>
+#elif defined(__APPLE__) && defined(__MACH__)
+
+#include <libkern/OSByteOrder.h>
+
+#define htobe16(x) OSSwapHostToBigInt16(x)
+#define htole16(x) OSSwapHostToLittleInt16(x)
+#define be16toh(x) OSSwapBigToHostInt16(x)
+#define le16toh(x) OSSwapLittleToHostInt16(x)
+
+#define htobe32(x) OSSwapHostToBigInt32(x)
+#define htole32(x) OSSwapHostToLittleInt32(x)
+#define be32toh(x) OSSwapBigToHostInt32(x)
+#define le32toh(x) OSSwapLittleToHostInt32(x)
+
+#define htobe64(x) OSSwapHostToBigInt64(x)
+#define htole64(x) OSSwapHostToLittleInt64(x)
+#define be64toh(x) OSSwapBigToHostInt64(x)
+#define le64toh(x) OSSwapLittleToHostInt64(x)
+
 #else
 #include <cstdint>
-
 uint16_t htobe16(uint16_t int16);
 uint32_t htobe32(uint32_t int32);
 uint64_t htobe64(uint64_t int64);
@@ -21,3 +37,4 @@ uint64_t be64toh(uint64_t big64);
 #endif
 
 #endif // I2PENDIAN_H__
+

Makefile.osx

@@ -0,0 +1,43 @@
+#CC = clang++
+CC = g++
+CFLAGS = -g -Wall -std=c++11 -lstdc++
+OBJECTS = obj/CryptoConst.o obj/base64.o obj/NTCPSession.o obj/RouterInfo.o obj/Transports.o \
+	obj/RouterContext.o obj/NetDb.o obj/LeaseSet.o obj/Tunnel.o obj/TunnelEndpoint.o \
+	obj/TunnelGateway.o obj/TransitTunnel.o obj/I2NPProtocol.o obj/Log.o obj/Garlic.o \
+	obj/HTTPServer.o obj/Streaming.o obj/Identity.o obj/SSU.o obj/util.o obj/Reseed.o \
+	obj/UPnP.o obj/TunnelPool.o obj/HTTPProxy.o obj/AddressBook.o  obj/Daemon.o \
+	obj/DaemonLinux.o obj/SSUData.o obj/i2p.o obj/aes.o
+INCFLAGS = -DCRYPTOPP_DISABLE_ASM
+LDFLAGS = -Wl,-rpath,/usr/local/lib -lcryptopp -lboost_system -lboost_filesystem -lboost_regex -lboost_program_options -lpthread
+LIBS = 
+
+#check if AES-NI is supported by CPU
+ifneq ($(shell grep -c aes /proc/cpuinfo),0) 
+	CPU_FLAGS = -DAESNI
+endif
+
+# Apple Mac OSX
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Darwin)
+endif
+
+all: obj i2p
+
+i2p: $(OBJECTS:obj/%=obj/%)
+	$(CC) -o $@ $^ $(LDFLAGS) $(LIBS)
+
+.SUFFIXES:
+.SUFFIXES:	.c .cc .C .cpp .o
+
+obj/%.o : %.cpp
+	$(CC) -o $@ $< -c $(CFLAGS) $(INCFLAGS) $(CPU_FLAGS)
+
+obj:
+	mkdir -p obj
+
+clean:
+	rm -fr obj i2p
+
+.PHONY: all
+.PHONY: clean
+