diff --git a/configure.ac b/configure.ac
index 7f511e9..5abe1e2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,8 @@
 AC_INIT([r3], 1.0)
+AC_PREREQ([2.64])
 AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_MACRO_DIR([m4])
-AM_INIT_AUTOMAKE
+AM_INIT_AUTOMAKE([foreign])
 LT_INIT
 AC_PROG_CC
 AC_PROG_CC_STDC