From 4fd43c3ca2c9078e4c4355fef0e13db6e66a5d4a Mon Sep 17 00:00:00 2001
From: Stephan Bosch <stephan@rename-it.nl>
Date: Wed, 27 Jan 2016 01:21:07 +0100
Subject: [PATCH] configure: Matched first few lines with Dovecot's
 configure.ac.

---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index d4a7641eb..8a62065e2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,3 +1,7 @@
+AC_PREREQ([2.59])
+
+# Be sure to update ABI version also if anything changes that might require
+# recompiling plugins. Most importantly that means if any structs are changed.
 AC_INIT([Pigeonhole], [0.4.11], [dovecot@dovecot.org], [dovecot-2.2-pigeonhole])
 AC_DEFINE_UNQUOTED([PIGEONHOLE_ABI_VERSION], "0.4.ABIv2($PACKAGE_VERSION)", [Pigeonhole ABI version])
 
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