--- a/libgui/src/module.mk	Mon Jul 13 12:30:46 2020 -0400
+++ b/libgui/src/module.mk	Mon Jul 13 14:57:22 2020 -0400
@@ -222,6 +222,7 @@
   %reldir%/octave-qobject.h \
   %reldir%/qt-application.h \
   %reldir%/qt-interpreter-events.h \
+  %reldir%/qt-utils.h \
   %reldir%/resource-manager.h \
   %reldir%/settings-dialog.h \
   %reldir%/shortcut-manager.h \

--- a/libgui/src/qt-interpreter-events.cc	Mon Jul 13 12:30:46 2020 -0400
+++ b/libgui/src/qt-interpreter-events.cc	Mon Jul 13 14:57:22 2020 -0400
@@ -38,6 +38,7 @@
 #include "gui-preferences-ed.h"
 #include "octave-qobject.h"
 #include "qt-interpreter-events.h"
+#include "qt-utils.h"
 
 #include "localcharset-wrapper.h"
 #include "oct-env.h"
@@ -161,8 +162,8 @@
     QStringList lst
       = m_uiwidget_creator.input_dialog (make_qstring_list (prompt),
                                          QString::fromStdString (title),
-                                         QFloatList::fromStdList (nr),
-                                         QFloatList::fromStdList (nc),
+                                         std_list_to_qt_list<float> (nr),
+                                         std_list_to_qt_list<float> (nc),
                                          make_qstring_list (defaults));
     std::list<std::string> retval;
 
@@ -186,13 +187,15 @@
       = m_uiwidget_creator.list_dialog (make_qstring_list (list),
                                         QString::fromStdString (mode),
                                         width, height,
-                                        QList<int>::fromStdList (initial),
+                                        std_list_to_qt_list<int> (initial),
                                         QString::fromStdString (name),
                                         make_qstring_list (prompt),
                                         QString::fromStdString (ok_string),
                                         QString::fromStdString (cancel_string));
 
-    return std::pair<std::list<int>, int> (result.first.toStdList (),
+    QIntList& lst = result.first;
+    return std::pair<std::list<int>, int> (std::list<int> (lst.begin (),
+                                                           lst.end ()),
                                            result.second);
   }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgui/src/qt-utils.h	Mon Jul 13 14:57:22 2020 -0400
@@ -0,0 +1,47 @@
+////////////////////////////////////////////////////////////////////////
+//
+// Copyright (C) 2020 The Octave Project Developers
+//
+// See the file COPYRIGHT.md in the top-level directory of this
+// distribution or <https://octave.org/copyright/>.
+//
+// This file is part of Octave.
+//
+// Octave is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Octave is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Octave; see the file COPYING.  If not, see
+// <https://www.gnu.org/licenses/>.
+//
+////////////////////////////////////////////////////////////////////////
+
+#if ! defined (octave_qt_utils_h)
+#define octave_qt_utils_h 1
+
+#include <list>
+
+#include <QList>
+
+namespace octave
+{
+  template <typename T>
+  QList<T>
+  std_list_to_qt_list (const std::list<T>& lst)
+  {
+#if defined (HAVE_QLIST_ITERATOR_CONSTRUCTOR)
+    return QList<T> (lst.begin (), lst.end ());
+#else
+    return QList<T>::fromStdList (lst);
+#endif
+  }
+}
+
+#endif

--- a/m4/acinclude.m4	Mon Jul 13 12:30:46 2020 -0400
+++ b/m4/acinclude.m4	Mon Jul 13 14:57:22 2020 -0400
@@ -461,6 +461,35 @@
   fi
 ])
 dnl
+dnl Check whether the Qt class QList has a constructor that accepts
+dnl a pair of iterators.  This constructor was introduced in Qt 5.14.
+dnl
+AC_DEFUN([OCTAVE_CHECK_FUNC_QLIST_ITERATOR_CONSTRUCTOR], [
+  AC_CACHE_CHECK([for QList<T>::QList (iterator, iterator) constructor],
+    [octave_cv_func_qlist_iterator_constructor],
+    [AC_LANG_PUSH(C++)
+    ac_octave_save_CPPFLAGS="$CPPFLAGS"
+    ac_octave_save_CXXFLAGS="$CXXFLAGS"
+    CPPFLAGS="$QT_CPPFLAGS $CXXPICFLAG $CPPFLAGS"
+    CXXFLAGS="$CXXPICFLAG $CXXFLAGS"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+        #include <QList>
+        ]], [[
+        QList<int> lst_one;
+        QList<int> lst_two (lst_one.begin (), lst_one.end ());
+        ]])],
+      octave_cv_func_qlist_iterator_constructor=yes,
+      octave_cv_func_qlist_iterator_constructor=no)
+    CPPFLAGS="$ac_octave_save_CPPFLAGS"
+    CXXFLAGS="$ac_octave_save_CXXFLAGS"
+    AC_LANG_POP(C++)
+  ])
+  if test $octave_cv_func_qlist_iterator_constructor = yes; then
+    AC_DEFINE(HAVE_QLIST_ITERATOR_CONSTRUCTOR, 1,
+      [Define to 1 if you have the `QList<T>::QList (iterator, iterator)' constructor.])
+  fi
+])
+dnl
 dnl Check whether HDF5 library has version 1.6 API functions.
 dnl
 AC_DEFUN([OCTAVE_CHECK_HDF5_HAS_VER_16_API], [
@@ -1763,6 +1792,7 @@
     OCTAVE_CHECK_FUNC_QGUIAPPLICATION_SETDESKTOPFILENAME
     OCTAVE_CHECK_FUNC_QHELPSEARCHQUERYWIDGET_SEARCHINPUT
     OCTAVE_CHECK_FUNC_QSCREEN_DEVICEPIXELRATIO
+    OCTAVE_CHECK_FUNC_QLIST_ITERATOR_CONSTRUCTOR
 
     if test -n "$OPENGL_LIBS"; then
       OCTAVE_CHECK_QT_OPENGL_OK([build_qt_graphics=yes],