Index: oo7/Cargo.toml
===================================================================
--- oo7.orig/Cargo.toml
+++ oo7/Cargo.toml
@@ -103,6 +103,7 @@ optional = true
 
 [dependencies.futures-util]
 version = "0.3"
+features = ["io"]
 
 [dependencies.hkdf]
 version = "0.12"