1 files changed, 1 insertions, 0 deletions
diff --git a/src/task.h b/src/task.h
index 78dc904..7068c8a 100644
--- a/src/task.h
+++ b/src/task.h
@@ -35,6 +35,7 @@ public:
 	virtual int clean() = 0 ;
 	virtual std::vector<std::string> depends() const = 0;
 	virtual std::string target() const = 0;
+	virtual bool derived() const = 0;
 
 	virtual std::string toJSON() const { return {}; };