diff --git a/rkward/dialogs/rksetupwizard.h b/rkward/dialogs/rksetupwizard.h
index a814f1f7..9c22d479 100644
--- a/rkward/dialogs/rksetupwizard.h
+++ b/rkward/dialogs/rksetupwizard.h
@@ -1,98 +1,99 @@
 /***************************************************************************
                           rksetupwizard  -  description
                              -------------------
     begin                : Fri May 25 20200
     copyright            : (C) 2020 by Thomas Friedrichsmeier
     email                : thomas.friedrichsmeier@kdemail.net
  ***************************************************************************/
 
 /***************************************************************************
  *                                                                         *
  *   This program 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 2 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  ***************************************************************************/
 
 #ifndef RKSETUPWIZARD_H
 #define RKSETUPWIZARD_H
 
+#include <functional>
 #include <KAssistantDialog>
 
 class QGridLayout;
 class QLabel;
 class RKSetupWizardItem;
 class RKSetupWizard : public KAssistantDialog {
 protected:
 	enum InvokationReason {
 		ProblemsDetected,
 		NewVersionRKWard,
 		NewVersionR,
 		ManualCheck
 	};
 
 	RKSetupWizard(QWidget* parent, InvokationReason reason, const QList<RKSetupWizardItem*> &settings_items);
 	~RKSetupWizard();
 
 	static bool has_been_run;
 public:
 	static void doAutoCheck();
 	static void fullInteractiveCheck(InvokationReason reason, const QList<RKSetupWizardItem*> &settings_items = QList<RKSetupWizardItem*>());
 	static void manualCheck();
 
 	void markSoftwareForInstallation(const QString &name, const QString &download_url, bool install);
 	void markRPackageForInstallation(const QString &name, bool install);
 private:
 	QStringList software_to_install;
 	QStringList software_to_install_urls;
 	QStringList packages_to_install;
 	void createStandardPage();
 	QWidget *current_page;
 	int current_row;
 	QGridLayout* current_layout;
 	void appendItem(RKSetupWizardItem* item);
 	QList<RKSetupWizardItem*> items;
 	bool reinstallation_required;
 
 	void next() override;
 	KPageWidgetItem *second_to_last_page_ref;
 	QLabel* last_page_label;
 };
 
 class QComboBox;
 class RKSetupWizardItem {
 public:
 	enum Status {
 		Error,
 		Warning,
 		Good
 	};
 	RKSetupWizardItem(const QString &shortlabel, const QString &longlabel=QString(), Status status=Good, const QString &shortstatuslabel=QString()) : status(status), shortlabel(shortlabel), longlabel(longlabel), shortstatuslabel(shortstatuslabel), box(nullptr) {};
 	~RKSetupWizardItem() {};
 	void addOption(const QString &shortlabel, const QString &longlabel, std::function<void(RKSetupWizard*)> callback) {
 		options.append(Option(shortlabel, longlabel, callback));
 	}
 	void setStatus(Status _status, const QString &_shortstatuslabel) { status = _status; shortstatuslabel = _shortstatuslabel; };
 	void setShortLabel(const QString &label) { shortlabel = label; };
 	void setLongLabel(const QString &label) { longlabel = label; };
 private:
 friend class RKSetupWizard;
 	void createWidget(QGridLayout *layout, int row);
 	void apply(RKSetupWizard *wizard);
 
 	struct Option {
 		Option(const QString &shortlabel, const QString &longlabel, std::function<void(RKSetupWizard*)> callback) : shortlabel(shortlabel), longlabel(longlabel), callback(callback) {};
 		QString shortlabel;
 		QString longlabel;
 		std::function<void(RKSetupWizard*)> callback;
 	};
 	QList<Option> options;
 	Status status;
 	QString shortlabel;
 	QString longlabel;
 	QString shortstatuslabel;
 	QComboBox *box;
 };
 
 #endif