getting there...

llvm-svn: 25021
diff --git a/llvm/lib/Transforms/Scalar/LowerPacked.cpp b/llvm/lib/Transforms/Scalar/LowerPacked.cpp
index 725a4ba..45ed8b4 100644
--- a/llvm/lib/Transforms/Scalar/LowerPacked.cpp
+++ b/llvm/lib/Transforms/Scalar/LowerPacked.cpp
@@ -24,6 +24,7 @@
 #include <algorithm>
 #include <map>
 #include <iostream>
+#include <functional>
 
 using namespace llvm;