diff --git a/cbits/emacs-module.h b/cbits/emacs-module.h
new file mode 100644
--- /dev/null
+++ b/cbits/emacs-module.h
@@ -0,0 +1,197 @@
+/* emacs-module.h - GNU Emacs module API.
+
+Copyright (C) 2015-2016 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs 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.
+
+GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef EMACS_MODULE_H
+#define EMACS_MODULE_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#if defined __cplusplus && __cplusplus >= 201103L
+# define EMACS_NOEXCEPT noexcept
+#else
+# define EMACS_NOEXCEPT
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Current environment.  */
+typedef struct emacs_env_25 emacs_env;
+
+/* Opaque pointer representing an Emacs Lisp value.
+   BEWARE: Do not assume NULL is a valid value!  */
+typedef struct emacs_value_tag *emacs_value;
+
+enum { emacs_variadic_function = -2 };
+
+/* Struct passed to a module init function (emacs_module_init).  */
+struct emacs_runtime
+{
+  /* Structure size (for version checking).  */
+  ptrdiff_t size;
+
+  /* Private data; users should not touch this.  */
+  struct emacs_runtime_private *private_members;
+
+  /* Return an environment pointer.  */
+  emacs_env *(*get_environment) (struct emacs_runtime *ert);
+};
+
+
+/* Possible Emacs function call outcomes.  */
+enum emacs_funcall_exit
+{
+  /* Function has returned normally.  */
+  emacs_funcall_exit_return = 0,
+
+  /* Function has signaled an error using `signal'.  */
+  emacs_funcall_exit_signal = 1,
+
+  /* Function has exit using `throw'.  */
+  emacs_funcall_exit_throw = 2,
+};
+
+struct emacs_env_25
+{
+  /* Structure size (for version checking).  */
+  ptrdiff_t size;
+
+  /* Private data; users should not touch this.  */
+  struct emacs_env_private *private_members;
+
+  /* Memory management.  */
+
+  emacs_value (*make_global_ref) (emacs_env *env,
+				  emacs_value any_reference);
+
+  void (*free_global_ref) (emacs_env *env,
+			   emacs_value global_reference);
+
+  /* Non-local exit handling.  */
+
+  enum emacs_funcall_exit (*non_local_exit_check) (emacs_env *env);
+
+  void (*non_local_exit_clear) (emacs_env *env);
+
+  enum emacs_funcall_exit (*non_local_exit_get)
+    (emacs_env *env,
+     emacs_value *non_local_exit_symbol_out,
+     emacs_value *non_local_exit_data_out);
+
+  void (*non_local_exit_signal) (emacs_env *env,
+				 emacs_value non_local_exit_symbol,
+				 emacs_value non_local_exit_data);
+
+  void (*non_local_exit_throw) (emacs_env *env,
+				emacs_value tag,
+				emacs_value value);
+
+  /* Function registration.  */
+
+  emacs_value (*make_function) (emacs_env *env,
+				ptrdiff_t min_arity,
+				ptrdiff_t max_arity,
+				emacs_value (*function) (emacs_env *env,
+							 ptrdiff_t nargs,
+							 emacs_value args[],
+							 void *)
+				  EMACS_NOEXCEPT,
+				const char *documentation,
+				void *data);
+
+  emacs_value (*funcall) (emacs_env *env,
+                          emacs_value function,
+                          ptrdiff_t nargs,
+                          emacs_value args[]);
+
+  emacs_value (*intern) (emacs_env *env,
+                         const char *symbol_name);
+
+  /* Type conversion.  */
+
+  emacs_value (*type_of) (emacs_env *env,
+			  emacs_value value);
+
+  bool (*is_not_nil) (emacs_env *env, emacs_value value);
+
+  bool (*eq) (emacs_env *env, emacs_value a, emacs_value b);
+
+  intmax_t (*extract_integer) (emacs_env *env, emacs_value value);
+
+  emacs_value (*make_integer) (emacs_env *env, intmax_t value);
+
+  double (*extract_float) (emacs_env *env, emacs_value value);
+
+  emacs_value (*make_float) (emacs_env *env, double value);
+
+  /* Copy the content of the Lisp string VALUE to BUFFER as an utf8
+     null-terminated string.
+
+     SIZE must point to the total size of the buffer.  If BUFFER is
+     NULL or if SIZE is not big enough, write the required buffer size
+     to SIZE and return false.
+
+     Note that SIZE must include the last null byte (e.g. "abc" needs
+     a buffer of size 4).
+
+     Return true if the string was successfully copied.  */
+
+  bool (*copy_string_contents) (emacs_env *env,
+                                emacs_value value,
+                                char *buffer,
+                                ptrdiff_t *size_inout);
+
+  /* Create a Lisp string from a utf8 encoded string.  */
+  emacs_value (*make_string) (emacs_env *env,
+			      const char *contents, ptrdiff_t length);
+
+  /* Embedded pointer type.  */
+  emacs_value (*make_user_ptr) (emacs_env *env,
+				void (*fin) (void *) EMACS_NOEXCEPT,
+				void *ptr);
+
+  void *(*get_user_ptr) (emacs_env *env, emacs_value uptr);
+  void (*set_user_ptr) (emacs_env *env, emacs_value uptr, void *ptr);
+
+  void (*(*get_user_finalizer) (emacs_env *env, emacs_value uptr))
+    (void *) EMACS_NOEXCEPT;
+  void (*set_user_finalizer) (emacs_env *env,
+			      emacs_value uptr,
+			      void (*fin) (void *) EMACS_NOEXCEPT);
+
+  /* Vector functions.  */
+  emacs_value (*vec_get) (emacs_env *env, emacs_value vec, ptrdiff_t i);
+
+  void (*vec_set) (emacs_env *env, emacs_value vec, ptrdiff_t i,
+		   emacs_value val);
+
+  ptrdiff_t (*vec_size) (emacs_env *env, emacs_value vec);
+};
+
+/* Every module should define a function as follows.  */
+extern int emacs_module_init (struct emacs_runtime *ert);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EMACS_MODULE_H */
diff --git a/cbits/stab.c b/cbits/stab.c
--- a/cbits/stab.c
+++ b/cbits/stab.c
@@ -1,6 +1,6 @@
 #include <HsFFI.h>
 #include <string.h>
-#include "./emacs-module.h"
+#include <emacs-module.h>
 /* extern void __stginit_Lib(void); */
 
 /* Declare mandatory GPL symbol.  */
diff --git a/haskelisp.cabal b/haskelisp.cabal
--- a/haskelisp.cabal
+++ b/haskelisp.cabal
@@ -1,5 +1,5 @@
 name: haskelisp
-version: 0.1.0.4
+version: 0.1.0.5
 cabal-version: >=1.10
 build-type: Simple
 license: GPL-3
@@ -14,6 +14,8 @@
 author: Takenari Shinohara
 extra-source-files:
     README.md
+    cbits/*.c
+    cbits/*.h
 
 source-repository head
     type: git
@@ -37,5 +39,6 @@
     c-sources:
         cbits/stab.c
     default-language: Haskell2010
+    include-dirs: cbits/
     hs-source-dirs: src