dnl @synopsis AC_PROG_JAVAH
dnl
dnl AC_PROG_JAVAH tests the availability of the javah header generator
dnl and looks for the jni.h header file. If available, JAVAH is set to
dnl the full path of javah and CPPFLAGS is updated accordingly.
dnl
dnl @category Java
dnl @author Luc Maisonobe <luc@spaceroots.org>
dnl @version 2002-03-25
dnl @license AllPermissive

AC_DEFUN([AC_PROG_JAVAH],[
AC_REQUIRE([AC_CANONICAL_SYSTEM])dnl
AC_REQUIRE([AC_PROG_CPP])dnl
AC_PATH_PROG(JAVAH,javah)
if test x"`eval 'echo $ac_cv_path_JAVAH'`" != x ; then
  AC_TRY_CPP([#include <jni.h>],,[
    ac_save_CPPFLAGS="$CPPFLAGS"
changequote(, )dnl
    ac_dir=`echo $ac_cv_path_JAVAH | sed 's,\(.*\)/[^/]*/[^/]*$,\1/include,'`
    ac_machdep=`echo $build_os | sed 's,[-0-9].*,,' | sed 's,cygwin,win32,'`
changequote([, ])dnl
    CPPFLAGS="$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"])
fi])