Version-specific stuff for Berkeley DB.

+dnl This file is part of GNU mailutils.
+dnl Copyright (C) 2003 Free Software Foundation, Inc.
+dnl
+dnl GNU Mailutils is free software; you can redistribute it and/or modify
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+dnl any later version.
+dnl 
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+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 Mailutils; if not, write to the Free Software
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+dnl
+
+AH_TEMPLATE(BDB2_CURSOR_LASTARG,
+            [Last argument to the cursor member of Berkeley 2 DB structure])
+
+dnl The cursor member of DB structure used to take three arguments in older
+dnl implementations of Berkeley DB. Newer versions (db.h >= 11.238) declare
+dnl it as taking four arguments.
+dnl This macro checks which of the variants we have.
+AC_DEFUN(MU_DB2_CURSOR,
+ [AC_CACHE_CHECK([whether db->cursor takes 4 arguments],
+                 [mu_cv_bdb2_cursor_four_args],
+  [AC_TRY_COMPILE([#include <db.h>],
+                  [
+DB *db;
+db->cursor(NULL, NULL, NULL, 0)
+                  ],
+                  [mu_cv_bdb2_cursor_four_args=yes],
+                  [mu_cv_bdb2_cursor_four_args=no])])
+ if test $mu_cv_bdb2_cursor_four_args = yes; then
+   AC_DEFINE(BDB2_CURSOR_LASTARG,[,0])
+ else
+   AC_DEFINE(BDB2_CURSOR_LASTARG,[])
+ fi])
+
+