diff --git a/cc/linkable.go b/cc/linkable.go
index 2309fe8..1672366 100644
--- a/cc/linkable.go
+++ b/cc/linkable.go
@@ -94,12 +94,16 @@
 	SelectedStl() string
 
 	BuildStaticVariant() bool
+	BuildRlibVariant() bool
 	BuildSharedVariant() bool
 	SetStatic()
 	SetShared()
 	IsPrebuilt() bool
 	Toc() android.OptionalPath
 
+	// IsRustFFI returns true if this is a Rust FFI library.
+	IsRustFFI() bool
+
 	// IsFuzzModule returns true if this a *_fuzz module.
 	IsFuzzModule() bool