Update Makefile

diff --git a/ast b/ast
index aba60a5a0dd1deb0b9b050c928fc0457957619f3..60043131318a6c664df13d3dabbe29da986da938 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit aba60a5a0dd1deb0b9b050c928fc0457957619f3
+Subproject commit 60043131318a6c664df13d3dabbe29da986da938