--- /dev/null
+dnl
+dnl Copyright 2003 Free Software Foundation, Inc.
+dnl
+dnl This file is part of GNU Radio
+dnl
+dnl GNU Radio is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3, or (at your option)
+dnl any later version.
+dnl
+dnl GNU Radio is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with GNU Radio; see the file COPYING. If not, write to
+dnl the Free Software Foundation, Inc., 51 Franklin Street,
+dnl Boston, MA 02110-1301, USA.
+
+AC_DEFUN([GR_CHECK_SHM_OPEN],
+[
+ SHM_OPEN_LIBS=""
+ save_LIBS="$LIBS"
+ AC_SEARCH_LIBS([shm_open], [rt], [SHM_OPEN_LIBS="$LIBS"])
+ AC_CHECK_FUNCS([shm_open])
+ LIBS="$save_LIBS"
+ AC_SUBST(SHM_OPEN_LIBS)
+])