diff --git a/configure.ac b/configure.ac
index 92dc01b..42cb20b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -71,6 +71,16 @@ AC_FUNC_MBRTOWC
 AC_FUNC_REALLOC
 AC_CHECK_FUNCS([clock_gettime gettimeofday inet_ntoa iswprint memchr memset nl_langinfo setenv setlocale socket strchr strdup strerror strtol wcwidth])
 
+AC_CHECK_DECL([htobe64],
+  [AC_DEFINE([HAVE_HTOBE64], [1],
+  [Define if htobe64 and friends exist.])],
+  [AC_CHECK_DECL([OSSwapHostToBigInt64],
+     [AC_DEFINE([HAVE_OSX_SWAP], [1],
+        [Define if OSSwapHostToBigInt64 and friends exist.])],
+     [AC_MSG_ERROR([Unable to find byte swapping functions])],
+     [[#include <libkern/OSByteOrder.h>]])],
+  [[#include <endian.h>]])
+
 # Checks for protobuf
 PKG_CHECK_MODULES([protobuf], [protobuf])
 
diff --git a/src/crypto/Makefile.am b/src/crypto/Makefile.am
index e55a647..c239b43 100644
--- a/src/crypto/Makefile.am
+++ b/src/crypto/Makefile.am
@@ -2,4 +2,13 @@ AM_CXXFLAGS = $(WARNING_CXXFLAGS) $(PICKY_CXXFLAGS) -fno-default-inline -pipe
 
 noinst_LIBRARIES = libmoshcrypto.a
 
-libmoshcrypto_a_SOURCES = ae.h base64.cc base64.h crypto.cc crypto.h ocb.cc rijndael-alg-fst.cc rijndael-alg-fst.h
\ No newline at end of file
+libmoshcrypto_a_SOURCES = \
+	ae.h \
+	base64.cc \
+	base64.h \
+	byteorder.h \
+	crypto.cc \
+	crypto.h \
+	ocb.cc \
+	rijndael-alg-fst.cc \
+	rijndael-alg-fst.h
diff --git a/src/crypto/base64.h b/src/crypto/base64.h
index 8efa678..7593e59 100644
--- a/src/crypto/base64.h
+++ b/src/crypto/base64.h
@@ -1,7 +1,5 @@
 /* Taken from GNU coreutils */
 
-#define restrict
-
 /* base64.h -- Encode binary data using printable characters.
    Copyright (C) 2004-2006, 2009-2011 Free Software Foundation, Inc.
    Written by Simon Josefsson.
@@ -23,6 +21,8 @@
 #ifndef BASE64_H
 # define BASE64_H
 
+# include "config.h"
+
 /* Get size_t. */
 # include <stddef.h>
 
diff --git a/src/crypto/byteorder.h b/src/crypto/byteorder.h
new file mode 100644
index 0000000..f0c7f06
--- /dev/null
+++ b/src/crypto/byteorder.h
@@ -0,0 +1,34 @@
+/*
+    Mosh: the mobile shell
+    Copyright 2012 Keith Winstein
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef BYTEORDER_HPP
+#define BYTEORDER_HPP
+
+#include "config.h"
+
+#ifdef HAVE_HTOBE64
+# include <endian.h>
+#elif HAVE_OSX_SWAP
+# include <libkern/OSByteOrder.h>
+# define htobe64 OSSwapHostToBigInt64
+# define be64toh OSSwapBigToHostInt64
+# define htobe16 OSSwapHostToBigInt16
+# define be16toh OSSwapBigToHostInt16
+#endif
+
+#endif
diff --git a/src/crypto/crypto.cc b/src/crypto/crypto.cc
index e5ee202..2e90ca8 100644
--- a/src/crypto/crypto.cc
+++ b/src/crypto/crypto.cc
@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <stdlib.h>
 
+#include "byteorder.h"
 #include "crypto.h"
 #include "base64.h"
 
diff --git a/src/network/network.cc b/src/network/network.cc
index b424158..089a587 100644
--- a/src/network/network.cc
+++ b/src/network/network.cc
@@ -21,10 +21,10 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <assert.h>
-#include <endian.h>
 #include <errno.h>
 
 #include "dos_assert.h"
+#include "byteorder.h"
 #include "network.h"
 #include "crypto.h"
 
diff --git a/src/network/transportfragment.cc b/src/network/transportfragment.cc
index 3a7be02..04a6884 100644
--- a/src/network/transportfragment.cc
+++ b/src/network/transportfragment.cc
@@ -16,9 +16,9 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <endian.h>
 #include <assert.h>
 
+#include "byteorder.h"
 #include "transportfragment.h"
 #include "transportinstruction.pb.h"
 #include "compressor.h"