Fix compilation when SSL_OP_SINGLE_ECDH_USE isn't defined
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 97fc07f..e25f354 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -2547,7 +2547,9 @@
PyModule_AddIntConstant(m, "OP_CIPHER_SERVER_PREFERENCE",
SSL_OP_CIPHER_SERVER_PREFERENCE);
PyModule_AddIntConstant(m, "OP_SINGLE_DH_USE", SSL_OP_SINGLE_DH_USE);
+#ifdef SSL_OP_SINGLE_ECDH_USE
PyModule_AddIntConstant(m, "OP_SINGLE_ECDH_USE", SSL_OP_SINGLE_ECDH_USE);
+#endif
#ifdef SSL_OP_NO_COMPRESSION
PyModule_AddIntConstant(m, "OP_NO_COMPRESSION",
SSL_OP_NO_COMPRESSION);