For some reason, pre-processing should be done after the other includes

(..)

Author: bartvstratum

main.cpp

@@ -22,14 +22,14 @@
  * along with CLASS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#if QT_VERSION < 0x050000
+#include "mainwindow.h"
+
+#if QT_VERSION < QT_VERSION_CHECK(5,0,0)
   #include <QtGui/QApplication>
 #else
   #include <QtWidgets>
 #endif
 
-#include "mainwindow.h"
-
 int main(int argc, char *argv[])
 {
   QApplication a(argc, argv);

mainwindow.h

@@ -25,16 +25,16 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
-#if QT_VERSION < 0x050000
+#include <QModelIndex>
+#include "modelrun.h"
+#include "landsoil.h"
+
+#if QT_VERSION < QT_VERSION_CHECK(5,0,0)
   #include <QtGui/QMainWindow>
 #else
   #include <QtWidgets/QMainWindow>
 #endif
 
-#include <QModelIndex>
-#include "modelrun.h"
-#include "landsoil.h"
-
 class plotwindow;
 
 namespace Ui

plotwindow.h

@@ -25,20 +25,20 @@
 #ifndef PLOTWINDOW_H
 #define PLOTWINDOW_H
 
-#if QT_VERSION < 0x050000
+#include "mainwindow.h"
+#include "subplot.h"
+#include "QPaintEvent"
+#include "QPainter"
+#include "QTreeWidget"
+
+#if QT_VERSION < QT_VERSION_CHECK(5,0,0)
   #include <QtGui/QWidget>
   #include <QtGui/QTabWidget>
 #else
   #include <QtWidgets/QWidget>
   #include <QtWidgets/QTabWidget>
 #endif
 
-#include "mainwindow.h"
-#include "subplot.h"
-#include "QPaintEvent"
-#include "QPainter"
-#include "QTreeWidget"
-
 class modelrun;
 class subplot;
 

subplot.h

@@ -25,14 +25,6 @@
 #ifndef SUBPLOT_H
 #define SUBPLOT_H
 
-#if QT_VERSION < 0x050000
-  #include <QtGui/QWidget>
-  #include "QPrinter"
-#else
-  #include <QtWidgets/QWidget>
-  #include <QtPrintSupport/QPrinter>
-#endif
-
 #include "mainwindow.h"
 #include <QWidget>
 #include "QPaintEvent"
@@ -47,6 +39,14 @@
 #include <QPointF>
 #include <QRubberBand>
 
+#if QT_VERSION < QT_VERSION_CHECK(5,0,0)
+  #include <QtGui/QWidget>
+  #include "QPrinter"
+#else
+  #include <QtWidgets/QWidget>
+  #include <QtPrintSupport/QPrinter>
+#endif
+
 class plotarea : public QWidget
 {
   Q_OBJECT