+#
+# LC_EXPORT_NR_FREE_BUFFER_PAGES
+# starting from 2.6.23 linux kernel exports nr_free_buffer_pages()
+#
+AC_DEFUN([LC_EXPORT_NR_FREE_BUFFER_PAGES],
+[LB_CHECK_SYMBOL_EXPORT([nr_free_buffer_pages],
+[mm/page_alloc.c],[
+ AC_DEFINE(HAVE_EXPORT_NR_FREE_BUFFER_PAGES, 1, [kernel exports nr_free_buffer_pages])
+],[
+ if test x$enable_server = xyes ; then
+ AC_MSG_ERROR([lustre server needs this symbol to be exported.])
+ fi
+])
+])
+