diff --git a/rkward/rbackend/rksessionvars.cpp b/rkward/rbackend/rksessionvars.cpp
index a4d0f2a1..dd48937c 100644
--- a/rkward/rbackend/rksessionvars.cpp
+++ b/rkward/rbackend/rksessionvars.cpp
@@ -1,151 +1,157 @@
 /***************************************************************************
                           rksessionvars  -  description
                              -------------------
     begin                : Thu Sep 08 2011
-    copyright            : (C) 2011, 2013 by Thomas Friedrichsmeier
+    copyright            : (C) 2011-2020 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.                                   *
  *                                                                         *
  ***************************************************************************/
 
 #include "rksessionvars.h"
 
 #include "rkrinterface.h"
 #include "../settings/rksettingsmoduledebug.h"
 #include "../settings/rksettingsmodulegeneral.h"
 #include "../version.h"
 
 #include <kcoreaddons_version.h>
 #if KCOREADDONS_VERSION >= QT_VERSION_CHECK(5,20,0)
 #include <kcoreaddons.h>
 #endif
 
 #include <QTemporaryFile>
 #include <QStandardPaths>
 #include <QSysInfo>
 
 #include "../debug.h"
 
 RKSessionVars* RKSessionVars::_instance = 0;
 quint32 RKSessionVars::rkward_version = 0;
 QString RKSessionVars::rkward_version_suffix;
 quint32 RKSessionVars::r_version = 0;
 QString RKSessionVars::r_version_string;
 
 RKSessionVars::RKSessionVars (RInterface *parent) : QObject (parent) {
 	RK_TRACE (RBACKEND);
 	RK_ASSERT (!_instance);
 
 	_instance = this;
 }
 
 RKSessionVars::~RKSessionVars () {
 	RK_TRACE (RBACKEND);
 }
 
 void RKSessionVars::setInstalledPackages (const QStringList &new_list) {
 	RK_TRACE (RBACKEND);
 
 	installed_packages = new_list;
 	emit (installedPackagesChanged ());
 }
 
 void RKSessionVars::setRVersion (const QString& version_string) {
 	RK_TRACE (RBACKEND);
 
 	if (!r_version_string.isEmpty ()) {
 		RK_DEBUG (RBACKEND, DL_WARNING, "R version has changed during runtime, from %s to %s", qPrintable (r_version_string), qPrintable (version_string));
 	}
 	r_version_string = version_string;
 	r_version = parseVersionString (version_string, 0);
 }
 
 QString RKSessionVars::RVersion(bool abbridged) {
 	if (!abbridged) return r_version_string;
 	return r_version_string.section ('.', 0, 1);
 }
 
 quint32 RKSessionVars::parseVersionString (const QString &version, QString *suffix) {
 	quint32 ret = 0;
 	int pos = -1;
 	int opos = 0;
 	for (int i = 3; i >= 0; --i) {
 		while (1) {
 			++pos;
 			if (!(pos < version.size () && version[pos].isDigit ())) {
 				int val = version.mid (opos, pos - opos).toInt ();
 				if ((val < 0) || (val > 255) || (pos == opos)) {
 					RK_DEBUG (MISC, DL_ERROR, "Invalid version specification '%s'", qPrintable (version));
 					if (val > 255) val = 255;
 					else val = 0;
 				}
 				ret += val << (8 * i);
 				if ((pos < version.size ()) && (version[pos] == '.')) {
 					opos = pos + 1;
 					break;
 				}
 				opos = pos;
 				i = -1;
 				break;
 			}
 		}
 	}
 	if (opos <= (version.size () - 1)) {
 		if (suffix) *suffix = version.mid (opos);
 		else RK_DEBUG (MISC, DL_WARNING, "Non numeric portion ('%s') of version specification '%s' will be ignored.", qPrintable (version.mid (opos)), qPrintable (version));
 	}
 
 	return ret;
 }
 
 int RKSessionVars::compareRKWardVersion (const QString& version) {
 	if (!rkward_version) {
 		rkward_version = parseVersionString (RKWARD_VERSION, &rkward_version_suffix);
 	}
 
 	QString suffix;
 	quint32 ver = parseVersionString (version, &suffix);
 	if (ver < rkward_version) return -1;
 	if (ver > rkward_version) return 1;
 	return (suffix.compare (rkward_version_suffix));
 }
 
 int RKSessionVars::compareRVersion (const QString& version) {
 	if (r_version_string.isEmpty()) return 0;
 
 	quint32 ver = parseVersionString (version, 0);
 	if (ver < r_version) return -1;
 	if (ver > r_version) return 1;
 	return 0;
 }
 
 QStringList RKSessionVars::frontendSessionInfo () {
 	QStringList lines;
 	lines.append ("RKWard version: " RKWARD_VERSION);
 	// KF5 TODO: find replacement for line below
 #if KCOREADDONS_VERSION >= QT_VERSION_CHECK(5,20,0)
 	lines.append ("KDE Frameworks version (runtime): " + QString (KCoreAddons::versionString ()));
 #endif
 	lines.append ("KDE Frameworks version (compile time): " KCOREADDONS_VERSION_STRING);
 	lines.append (QString ("Qt version (runtime): ") + qVersion ());
+	lines.append ("Qt version (compile time): " QT_VERSION_STR);
+#ifdef NO_QT_WEBENGINE
+	lines.append ("Using QtWebKit for HTML rendering");
+#else
+	lines.append ("Using QWebEngine for HTML rendering");
+#endif
 #if defined Q_OS_WIN
 	lines.append ("Windows runtime version (refer to QSysInfo documentation to translate code into human readable form): 0x" + QString::number (QSysInfo::windowsVersion (), 16));
 #elif defined Q_OS_MACOS
 	lines.append ("MacOS runtime version (refer to QSysInfo documentation to translate code into human readable form): 0x" + QString::number (QSysInfo::MacintoshVersion, 16));
 #endif
 	lines.append ("Local config directory: " + QStandardPaths::writableLocation (QStandardPaths::GenericConfigLocation));
 	lines.append ("RKWard storage directory: " + RKSettingsModuleGeneral::filesPath ());
 	lines.append ("Backend version (as known to the frontend): " + r_version_string);
 	lines.append (QString());
 	lines.append ("Debug message file (this may contain relevant diagnostic output in case of trouble):");
 	lines.append (RK_Debug::debug_file->fileName ());
 	return lines;
 }