blob: d3f9c7169819e026c18c239e92a88c77e606e570 (
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--- a/include/h2o/socket.h
+++ b/include/h2o/socket.h
@@ -29,6 +29,7 @@ extern "C" {
#include <stdint.h>
#include <sys/socket.h>
#include <openssl/ssl.h>
+#include <openssl/opensslconf.h>
#include "h2o/cache.h"
#include "h2o/memory.h"
#include "h2o/openssl_backport.h"
@@ -44,7 +45,11 @@ extern "C" {
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
#define H2O_USE_ALPN 1
+#ifndef OPENSSL_NO_NEXTPROTONEG
#define H2O_USE_NPN 1
+#else
+#define H2O_USE_NPN 0
+#endif
#elif OPENSSL_VERSION_NUMBER >= 0x10001000L
#define H2O_USE_ALPN 0
#define H2O_USE_NPN 1
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