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