From 0c4292c637d437d2b92408c6cf3078e39b83054d Mon Sep 17 00:00:00 2001
From: Max Lv <max.c.lv@gmail.com>
Date: Wed, 1 Feb 2017 22:51:39 +0800
Subject: [PATCH] Check version of libsodium

---
 m4/sodium.m4 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/m4/sodium.m4 b/m4/sodium.m4
index dd03503c..46d21db4 100644
--- a/m4/sodium.m4
+++ b/m4/sodium.m4
@@ -27,4 +27,14 @@ AC_DEFUN([ss_SODIUM],
     [AC_MSG_ERROR([The Sodium crypto library libraries not found.])]
     )
 
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+    #include <sodium.h>
+    ], [
+    #if SODIUM_LIBRARY_VERSION_MAJOR < 9
+    # error
+    #endif
+    ])],
+    [AC_MSG_RESULT([checking for version of libsodium... yes])],
+    [AC_MSG_ERROR([Wrong libsodium: version >= 1.0.9 required])])
+
 ])