Support compilation on platforms, such as debian expiremental, which are compiled without SSLv3
diff --git a/src/cryptography/hazmat/bindings/openssl/ssl.py b/src/cryptography/hazmat/bindings/openssl/ssl.py
index 3d6fc42..1aed28d 100644
--- a/src/cryptography/hazmat/bindings/openssl/ssl.py
+++ b/src/cryptography/hazmat/bindings/openssl/ssl.py
@@ -15,6 +15,7 @@
  * Internally invented symbols to tell which versions of SSL/TLS are supported.
 */
 static const long Cryptography_HAS_SSL2;
+static const long Cryptography_HAS_SSL3_METHOD;
 static const long Cryptography_HAS_TLSv1_1;
 static const long Cryptography_HAS_TLSv1_2;
 static const long Cryptography_HAS_SECURE_RENEGOTIATION;
@@ -384,6 +385,15 @@
 static const long Cryptography_HAS_SSL2 = 1;
 #endif
 
+#ifdef OPENSSL_NO_SSL3_METHOD
+static const long Cryptography_HAS_SSL3_METHOD = 0;
+SSL_METHOD* (*SSLv3_method)(void) = NULL;
+SSL_METHOD* (*SSLv3_client_method)(void) = NULL;
+SSL_METHOD* (*SSLv3_server_method)(void) = NULL;
+#else
+static const long Cryptography_HAS_SSL3_METHOD = 1;
+#endif
+
 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 static const long Cryptography_HAS_TLSEXT_HOSTNAME = 1;
 #else
@@ -554,6 +564,12 @@
         "SSLv2_server_method",
     ],
 
+    "Cryptography_HAS_SSL3_METHOD": [
+        "SSLv3_method",
+        "SSLv3_client_method",
+        "SSLv3_server_method",
+    ],
+
     "Cryptography_HAS_TLSEXT_HOSTNAME": [
         "SSL_set_tlsext_host_name",
         "SSL_get_servername",