diff --git a/cf/db.m4 b/cf/db.m4
new file mode 100644
index 000000000..f5e9cd0e4
--- /dev/null
+++ b/cf/db.m4
@@ -0,0 +1,40 @@
+dnl $Id$
+dnl
+dnl tests for various db libraries
+dnl
+AC_DEFUN([rk_DB],[berkeley_db=db
+AC_ARG_WITH(berkeley-db,
+[  --without-berkeley-db   if you don't want berkeley db],[
+if test "$withval" = no; then
+	berkeley_db=""
+fi
+])
+if test "$berkeley_db"; then
+  AC_CHECK_HEADERS([				\
+	db.h					\
+	db_185.h				\
+  ])
+fi
+
+AC_FIND_FUNC_NO_LIBS2(dbopen, $berkeley_db, [
+#include <stdio.h>
+#if defined(HAVE_DB_185_H)
+#include <db_185.h>
+#elif defined(HAVE_DB_H)
+#include <db.h>
+#endif
+],[NULL, 0, 0, 0, NULL])
+
+AC_FIND_FUNC_NO_LIBS(dbm_firstkey, $berkeley_db gdbm ndbm)
+AC_FIND_FUNC_NO_LIBS(db_create, $berkeley_db)
+
+DBLIB="$LIB_dbopen"
+if test "$LIB_dbopen" != "$LIB_db_create"; then
+        DBLIB="$DBLIB $LIB_db_create"
+fi
+if test "$LIB_dbopen" != "$LIB_dbm_firstkey"; then
+	DBLIB="$DBLIB $LIB_dbm_firstkey"
+fi
+AC_SUBST(DBLIB)dnl
+
+])