--- Makefile	2014-12-12 22:58:34.000000000 +0100
+++ Makefile	2015-08-03 23:40:32.177619138 +0200
@@ -61,6 +61,7 @@
 sbindir = $(exec_prefix)/sbin
 bindir = $(exec_prefix)/bin
 archdir = $(rubyarchdir)
+top_srcdir = ../..
 
 
 CC = gcc
--- ossl_ssl.c	2014-12-12 22:58:34.000000000 +0100
+++ ossl_ssl.c	2015-08-03 23:40:32.177619138 +0200
@@ -1878,6 +1878,19 @@
 # endif
 #endif /* !defined(OPENSSL_NO_SOCK) */

+#if OPENSSL_VERSION_NUMBER >= 0x10002000L
+static VALUE
+ossl_ssl_tmp_key(VALUE self)
+{
+       SSL *ssl;
+       EVP_PKEY *key;
+       ossl_ssl_data_get_struct(self, ssl);
+       if (!SSL_get_server_tmp_key(ssl, &key))
+               return Qnil;
+       return ossl_pkey_new(key);
+}
+#endif
+
 void
 Init_ossl_ssl(void)
 {
@@ -2238,6 +2241,9 @@
     rb_define_method(cSSLSocket, "session=",    ossl_ssl_set_session, 1);
     rb_define_method(cSSLSocket, "verify_result", ossl_ssl_get_verify_result, 0);
     rb_define_method(cSSLSocket, "client_ca", ossl_ssl_get_client_ca_list, 0);
+#if OPENSSL_VERSION_NUMBER >= 0x10002000L
+    rb_define_method(cSSLSocket, "tmp_key", ossl_ssl_tmp_key, 0);
+#endif
 # ifdef HAVE_OPENSSL_NPN_NEGOTIATED
     rb_define_method(cSSLSocket, "npn_protocol", ossl_ssl_npn_protocol, 0);
 # endif