diff -up psi4-2118f2f5b5ffbe66932b8a1f20f4553cd3ee9415/psi4/src/psi4/libpsio/aio_handler.cc.inc psi4-2118f2f5b5ffbe66932b8a1f20f4553cd3ee9415/psi4/src/psi4/libpsio/aio_handler.cc
--- psi4-2118f2f5b5ffbe66932b8a1f20f4553cd3ee9415/psi4/src/psi4/libpsio/aio_handler.cc.inc	2017-03-02 02:39:29.000000000 +0100
+++ psi4-2118f2f5b5ffbe66932b8a1f20f4553cd3ee9415/psi4/src/psi4/libpsio/aio_handler.cc	2017-03-02 16:23:57.896421578 +0100
@@ -39,6 +39,7 @@
 #include <unistd.h>
 #include <memory>
 #include <algorithm>
+#include <functional>
 
 using namespace std;