gnu: qtoctave: Fix build for Qt 5.11.

* gnu/packages/maths.scm (qtoctave)[source]: Add patch.
[native-inputs]: Add texlive.
* gnu/packages/patches/qtoctave-qt-5.11-fix.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1088,6 +1088,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/qemu-CVE-2018-11806.patch 		\
   %D%/packages/patches/qt4-ldflags.patch			\
   %D%/packages/patches/qtbase-use-TZDIR.patch			\
+  %D%/packages/patches/qtoctave-qt-5.11-fix.patch		\
   %D%/packages/patches/qtscript-disable-tests.patch		\
   %D%/packages/patches/quagga-reproducible-build.patch          \
   %D%/packages/patches/quassel-qt-5.11.patch			\

gnu/packages/maths.scm

@@ -1400,12 +1400,18 @@ script files.")
 (define-public qtoctave
   (package (inherit octave)
     (name "qtoctave")
+    (source (origin
+              (inherit (package-source octave))
+              (patches (append (origin-patches (package-source octave))
+                               (search-patches
+                                "qtoctave-qt-5.11-fix.patch")))))
     (inputs
      `(("qscintilla" ,qscintilla)
        ("qt" ,qtbase)
        ,@(package-inputs octave)))
     (native-inputs
      `(("qttools" , qttools) ;for lrelease
+       ("texlive" ,texlive) ;for texi2dvi
        ,@(package-native-inputs octave)))
     (arguments
      (substitute-keyword-arguments (package-arguments octave)

gnu/packages/patches/qtoctave-qt-5.11-fix.patch

@@ -0,0 +1,26 @@
+This patch comes from upstream:
+https://hg.savannah.gnu.org/hgweb/octave/rev/cdaa884568b1.
+
+# HG changeset patch
+# User Mike Miller <mtmiller@octave.org>
+# Date 1527214835 25200
+# Node ID cdaa884568b159549bd373f04386ff62417f6df9
+# Parent  9e39a53b4e007d3f79f88b711ab9fa5f2f24fbc9
+add Qt include needed to build against Qt 5.11 (bug #53978)
+
+* settings-dialog.cc: Add missing include for <QButtonGroup> to fix build
+failure with Qt 5.11.
+
+diff --git a/libgui/src/settings-dialog.cc b/libgui/src/settings-dialog.cc
+--- a/libgui/src/settings-dialog.cc
++++ b/libgui/src/settings-dialog.cc
+@@ -34,6 +34,8 @@
+ #include "workspace-model.h"
+ #include "settings-dialog.h"
+ #include "ui-settings-dialog.h"
++
++#include <QButtonGroup>
+ #include <QDir>
+ #include <QFileInfo>
+ #include <QFileDialog>
+