diff --git a/configure.ac b/configure.ac
index 9be3ee95..42b7b7c9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@
 #
 #-----------------------------------------------------------------------------
 
-AC_PREREQ([2.70])
+AC_PREREQ([2.59])
 
 #
 # Release procedure