diff --git a/android/util.go b/android/util.go
index 3fc4608..30d8ec6 100644
--- a/android/util.go
+++ b/android/util.go
@@ -308,6 +308,20 @@
 	return
 }
 
+// FilterListByPrefixes performs the same splitting as FilterList does, but treats the passed
+// filters as prefixes
+func FilterListByPrefix(list []string, filter []string) (remainder []string, filtered []string) {
+	for _, l := range list {
+		if HasAnyPrefix(l, filter) {
+			filtered = append(filtered, l)
+		} else {
+			remainder = append(remainder, l)
+		}
+	}
+
+	return
+}
+
 // FilterListPred returns the elements of the given list for which the predicate
 // returns true. Order is kept.
 func FilterListPred(list []string, pred func(s string) bool) (filtered []string) {
diff --git a/android/variable.go b/android/variable.go
index e06fb8a..933ddfd 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -162,6 +162,7 @@
 			Optimize struct {
 				Enabled *bool
 			}
+			Aaptflags []string
 		}
 
 		Uml struct {