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diff --git a/build/ac-macros/ctypesgen.m4 b/build/ac-macros/ctypesgen.m4
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+++ b/build/ac-macros/ctypesgen.m4
@@ -0,0 +1,78 @@
+dnl ===================================================================
+dnl   Licensed to the Apache Software Foundation (ASF) under one
+dnl   or more contributor license agreements.  See the NOTICE file
+dnl   distributed with this work for additional information
+dnl   regarding copyright ownership.  The ASF licenses this file
+dnl   to you under the Apache License, Version 2.0 (the
+dnl   "License"); you may not use this file except in compliance
+dnl   with the License.  You may obtain a copy of the License at
+dnl
+dnl     http://www.apache.org/licenses/LICENSE-2.0
+dnl
+dnl   Unless required by applicable law or agreed to in writing,
+dnl   software distributed under the License is distributed on an
+dnl   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+dnl   KIND, either express or implied.  See the License for the
+dnl   specific language governing permissions and limitations
+dnl   under the License.
+dnl ===================================================================
+dnl
+dnl ctypesgen.m4: Locates ctypesgen for building/installing ctypes-python.
+dnl
+
+AC_DEFUN(SVN_CHECK_CTYPESGEN,
+[
+  AC_ARG_WITH(ctypesgen,
+              AS_HELP_STRING([--with-ctypesgen=PATH],
+                             [Specify the path to ctypesgen.  This can either
+                              be the full path to a ctypesgen installation,
+                              the full path to a ctypesgen source tree or the
+                              full path to ctypesgen.py.]),
+  [
+    case "$withval" in
+      "no")
+        SVN_FIND_CTYPESGEN(no)
+      ;;
+      "yes")
+        SVN_FIND_CTYPESGEN(check)
+      ;;
+      *)
+        SVN_FIND_CTYPESGEN($withval)
+      ;;
+    esac
+  ],
+  [
+    SVN_FIND_CTYPESGEN(check)
+  ])
+])
+
+AC_DEFUN(SVN_FIND_CTYPESGEN,
+[
+  where=$1
+
+  CTYPESGEN=none
+
+  if test $where = check; then
+    AC_PATH_PROG(CTYPESGEN, "ctypesgen.py", none)
+  elif test $where != no; then
+    AC_MSG_CHECKING([for ctypesgen.py])
+
+    if test -f "$where"; then
+      CTYPESGEN="$where"
+    elif test -f "$where/bin/ctypesgen.py"; then
+      CTYPESGEN="$where/bin/ctypesgen.py"
+    else
+      CTYPESGEN="$where/ctypesgen.py"
+    fi
+
+    if test ! -f "$CTYPESGEN" || test ! -x "$CTYPESGEN"; then
+      AC_MSG_ERROR([Could not find ctypesgen at $where/ctypesgen.py or at
+                    $where/bin/ctypesgen.py])
+    else
+      AC_MSG_RESULT([$CTYPESGEN])
+    fi
+  fi
+
+  dnl We use CTYPESGEN in the Makefile
+  AC_SUBST(CTYPESGEN)
+])