--- src/error-helpers.cc.orig	2018-08-01 13:52:02.000000000 -0700
+++ src/error-helpers.cc	2019-03-09 09:25:24.000000000 -0700
@@ -21,6 +21,8 @@
 
 #include "error-helpers.h"
 
+#include <iostream>
+
 // call verror
 #ifdef HAVE_OCTAVE_VERROR_ARG_EXC
 void