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diff --git a/lib/stdlib/include/erl_bits.hrl b/lib/stdlib/include/erl_bits.hrl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1999-2009. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+%% This is an -*- erlang -*- file.
+%% Generic compiler options, passed from the erl_compile module.
+
+-type bt_endian():: 'big' | 'little' | 'native'.
+-type bt_sign() :: 'signed' | 'unsigned'.
+-type bt_type() :: 'integer' | 'float' | 'binary' | 'utf8' | 'utf16' | 'utf32'.
+-type bt_unit() :: 1..256.
+
+-record(bittype, {
+ type :: bt_type(),
+ unit :: bt_unit(), %% element unit
+ sign :: bt_sign(),
+ endian :: bt_endian()
+ }).
+
+-record(bitdefault, {
+ integer, %% default type for integer
+ float, %% default type for float
+ binary %% default type for binary
+ }).
+
+%%% (From config.hrl in the bitsyntax branch.)
+-define(SYS_ENDIAN, big).
+-define(SIZEOF_CHAR, 1).
+-define(SIZEOF_DOUBLE, 8).
+-define(SIZEOF_FLOAT, 4).
+-define(SIZEOF_INT, 4).
+-define(SIZEOF_LONG, 4).
+-define(SIZEOF_LONG_LONG, 8).
+-define(SIZEOF_SHORT, 2).