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diff --git a/m4/ax_prog_javah.m4 b/m4/ax_prog_javah.m4
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+++ b/m4/ax_prog_javah.m4
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+# ===========================================================================
+#       http://www.gnu.org/software/autoconf-archive/ax_prog_javah.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_PROG_JAVAH
+#
+# DESCRIPTION
+#
+#   AX_PROG_JAVAH tests the availability of the javah header generator and
+#   looks for the jni.h header file. If available, JAVAH is set to the full
+#   path of javah and CPPFLAGS is updated accordingly.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 7
+
+AU_ALIAS([AC_PROG_JAVAH], [AX_PROG_JAVAH])
+AC_DEFUN([AX_PROG_JAVAH],[
+AC_REQUIRE([AC_CANONICAL_BUILD])dnl
+AC_REQUIRE([AC_PROG_CPP])dnl
+AC_PATH_PROG(JAVAH,javah)
+AS_IF([test -n "$ac_cv_path_JAVAH"],
+      [
+        AC_TRY_CPP([#include <jni.h>],,[
+        ac_save_CPPFLAGS="$CPPFLAGS"
+        ax_prog_javah_bin_dir=`AS_DIRNAME([$ac_cv_path_JAVAH])`
+        ac_dir="`AS_DIRNAME([$ax_prog_javah_bin])`/include"
+        AS_CASE([$build_os],
+                [cygwin*],
+                [ac_machdep=win32],
+                [ac_machdep=`AS_ECHO($build_os) | sed 's,[[-0-9]].*,,'`])
+        CPPFLAGS="$ac_save_CPPFLAGS -I$ac_dir -I$ac_dir/$ac_machdep"
+        AC_TRY_CPP([#include <jni.h>],
+                   ac_save_CPPFLAGS="$CPPFLAGS",
+                   AC_MSG_WARN([unable to include <jni.h>]))
+        CPPFLAGS="$ac_save_CPPFLAGS"])
+      ])
+])