diff --git a/androidmk/parser/make_strings.go b/androidmk/parser/make_strings.go
index 00d331b..142dc71 100644
--- a/androidmk/parser/make_strings.go
+++ b/androidmk/parser/make_strings.go
@@ -29,6 +29,11 @@
 	}
 }
 
+func (ms *MakeString) Clone() (result *MakeString) {
+	clone := *ms
+	return &clone
+}
+
 func (ms *MakeString) Pos() Pos {
 	return ms.StringPos
 }
@@ -164,6 +169,12 @@
 	return s[len(s)-1] == uint8(ch)
 }
 
+func (ms *MakeString) ReplaceLiteral(input string, output string) {
+	for i := range ms.Strings {
+		ms.Strings[i] = strings.Replace(ms.Strings[i], input, output, -1)
+	}
+}
+
 func splitAnyN(s, sep string, n int) []string {
 	ret := []string{}
 	for n == -1 || n > 1 {