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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2016 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef OPENSSL_COMPAT_H
+
+# include <openssl/opensslv.h>
+
+# ifdef LIBRESSL_VERSION_NUMBER
+# define OPENSSL_1_1_API 0
+# define OPENSSL_1_1_1_API 0
+# define OPENSSL_3_0_0_API 0
+# define LIBRESSL_IN_USE 1
+# define LIBRESSL_LEGACY_API (LIBRESSL_VERSION_NUMBER < 0x20700000L)
+# define LIBRESSL_2_7_API (LIBRESSL_VERSION_NUMBER >= 0x20700000L)
+# define LIBRESSL_3_5_API (LIBRESSL_VERSION_NUMBER >= 0x30500000L)
+# else // !LIBRESSL_VERSION_NUMBER
+# define OPENSSL_1_1_API (OPENSSL_VERSION_NUMBER >= 0x1010000fL)
+# define OPENSSL_1_1_1_API (OPENSSL_VERSION_NUMBER >= 0x10101000L)
+# define OPENSSL_3_0_0_API (OPENSSL_VERSION_NUMBER >= 0x30000000L)
+# define LIBRESSL_IN_USE 0
+# define LIBRESSL_LEGACY_API 0
+# define LIBRESSL_2_7_API 0
+# define LIBRESSL_3_5_API 0
+# endif // !LIBRESSL_VERSION_NUMBER
+
+#endif // OPENSSL_COMPAT_H