--- src/bin/libint/tactic.h.orig	2018-08-27 23:11:44 UTC
+++ src/bin/libint/tactic.h
@@ -21,6 +21,7 @@
 #include <cmath>
 #include <cstdlib>
 #include <smart_ptr.h>
+#include <time.h>
 
 #ifndef _libint2_src_bin_libint_tactic_h_
 #define _libint2_src_bin_libint_tactic_h_
