Fix test/override.mk
diff --git a/ast.go b/ast.go
index f623c39..f4dd83f 100644
--- a/ast.go
+++ b/ast.go
@@ -43,6 +43,7 @@
 	lhs  string
 	rhs  string
 	cmds []string
+	cmdLineno int
 }
 
 func (ast *RuleAST) eval(ev *Evaluator) {