diff --git a/boost/detail/endian.hpp b/boost/detail/endian.hpp
index 98c870c..5692e62 100644
--- a/boost/detail/endian.hpp
+++ b/boost/detail/endian.hpp
@@ -45,11 +45,13 @@
 # define BOOST_BYTE_ORDER __BYTE_ORDER
 #elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) || \
     defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__) || \
+    defined(__BIGENDIAN__) && !defined(__LITTLEENDIAN__) || \
     defined(_STLP_BIG_ENDIAN) && !defined(_STLP_LITTLE_ENDIAN)
 # define BOOST_BIG_ENDIAN
 # define BOOST_BYTE_ORDER 4321
 #elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) || \
     defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__) || \
+    defined(__LITTLEENDIAN__) && !defined(__BIGENDIAN__) || \
     defined(_STLP_LITTLE_ENDIAN) && !defined(_STLP_BIG_ENDIAN)
 # define BOOST_LITTLE_ENDIAN
 # define BOOST_BYTE_ORDER 1234