Don't define __*_ENDIAN__ macro on Unix.

msgpack/fallback.py

@@ -11,7 +11,6 @@
     def dict_iteritems(d):
         return d.iteritems()
 
-
 else:
     int_types = int
     unicode = str
@@ -32,7 +31,6 @@ def _is_recursionerror(e):
             and e.args[0].startswith("maximum recursion depth exceeded")
         )
 
-
 else:
 
     def _is_recursionerror(e):
@@ -68,7 +66,6 @@ def write(self, s):
         def getvalue(self):
             return self.builder.build()
 
-
 else:
     USING_STRINGBUILDER = False
     from io import BytesIO as StringIO
@@ -143,7 +140,6 @@ def _unpack_from(f, b, o=0):
         """Explicit type cast for legacy struct.unpack_from"""
         return struct.unpack_from(f, bytes(b), o)
 
-
 else:
     _unpack_from = struct.unpack_from
 

setup.py

@@ -79,12 +79,10 @@ def __init__(self, *args, **kwargs):
 
 
 libraries = []
+macros = []
+
 if sys.platform == "win32":
     libraries.append("ws2_32")
-
-if sys.byteorder == "big":
-    macros = [("__BIG_ENDIAN__", "1")]
-else:
     macros = [("__LITTLE_ENDIAN__", "1")]
 
 ext_modules = []