From 99b4ff8b6f6681ef1f5c2a0ccab49b95aa15b75c Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 30 Jan 2014 11:24:15 +0100
Subject: http2-openssl: verify that NPN functionality is present

---
 lib/vtls/openssl.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib/vtls')

diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index 7374c133f..264dcf7c6 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -1400,6 +1400,12 @@ static void ssl_tls_trace(int direction, int ssl_ver, int content_type,
 #endif
 
 #ifdef USE_NGHTTP2
+
+#if !defined(HAVE_SSL_CTX_SET_NEXT_PROTO_SELECT_CB) || \
+  defined(OPENSSL_NO_NEXTPROTONEG)
+#error http2 builds require OpenSSL with NPN support
+#endif
+
 /*
  * in is a list of lenght prefixed strings. this function has to select
  * the protocol we want to use from the list and write its string into out.
-- 
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