diff --git a/erlang/apps/lib/include/pdp10_stdint.hrl b/erlang/apps/lib/include/pdp10_stdint.hrl
new file mode 100644
index 0000000..c9c7389
--- /dev/null
+++ b/erlang/apps/lib/include/pdp10_stdint.hrl
@@ -0,0 +1,51 @@
+%%% -*- erlang-indent-level: 2 -*-
+%%%
+%%% pdp10_stdint.hrl -- stdint.h clone for PDP10
+%%% Copyright (C) 2013-2019  Mikael Pettersson
+%%%
+%%% This file is part of pdp10-tools.
+%%%
+%%% pdp10-tools 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.
+%%%
+%%% pdp10-tools 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 pdp10-tools.  If not, see <http://www.gnu.org/licenses/>.
+%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%
+%%% Provide stdint.h-like type names and macros for 9, 18, and 36-bit unsigned
+%%% integer types.
+%%%
+%%% Standard uint<N>_t types must not contain any any extraneous bits, but that
+%%% cannot be guaranteed for these 9, 18, and 36-bit types embedded in Erlang
+%%% integers of unbounded precision.  For arithmetic on these types, use the
+%%% operations provided by pdp10_arith.
+%%%
+%%% Do not use these 18 or 36-bit types for file-level binary data structures,
+%%% instead use the pdp10_extint and pdp10_stdio facilities to explicitly
+%%% convert between file-level and host-level binary data structures.
+
+-ifndef(PDP10_STDINT_HRL).
+-define(PDP10_STDINT_HRL, 1).
+
+-define(PDP10_UINT9_MAX, ((1 bsl 9) - 1)).
+-type uint9_t() :: 0..?PDP10_UINT9_MAX.
+
+-define(PDP10_UINT18_MAX, ((1 bsl 18) - 1)).
+-type uint18_t() :: 0..?PDP10_UINT18_MAX.
+
+-define(PDP10_UINT36_MAX, ((1 bsl 36) - 1)).
+-type uint36_t() :: 0..?PDP10_UINT36_MAX.
+
+-define(PDP10_INT36_MAX, ((1 bsl (36 - 1)) - 1)).
+-define(PDP10_INT36_MIN, (-?PDP10_INT36_MAX - 1)).
+-type int36_t() :: ?PDP10_INT36_MIN..?PDP10_INT36_MAX.
+
+-endif. % PDP10_STDINT_HRL