diff --git a/src/configure.ac b/src/configure.ac
index 3745ac3d..09f1a210 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -442,11 +442,16 @@ else
   qmakevers="`${QMAKE} --version 2>&1`"
   #echo "qmake version: $qmakevers"
   v4=`expr "$qmakevers" : '.*Qt[ ][ ]*version[ ][ ]*4.*'`
-  if test X$v4 = X0 ; then 
+  v5=`expr "$qmakevers" : '.*Qt[ ][ ]*version[ ][ ]*5.*'`
+  if test X$v4 = X0 -a X$v5 = X0; then 
      AC_MSG_ERROR([qmake seems to be using Qt version 3 which is not supported any more])
      QTGUI=qtgui
   else
-    AC_MSG_NOTICE([using qt version 4 user interface])
+    if test X$v4 != X0 ; then
+       AC_MSG_NOTICE([using qt version 4 user interface])
+    else
+       AC_MSG_NOTICE([using qt version 5 user interface])
+    fi
     QTGUI=qtgui
   fi
   
diff --git a/src/qtgui/advsearch_w.cpp b/src/qtgui/advsearch_w.cpp
index 7b1e34c1..557a9483 100644
--- a/src/qtgui/advsearch_w.cpp
+++ b/src/qtgui/advsearch_w.cpp
@@ -341,7 +341,7 @@ size_t AdvSearch::stringToSize(QString qsize)
     size_t size = size_t(-1);
     qsize.replace(QRegExp("[\\s]+"), "");
     if (!qsize.isEmpty()) {
-	string csize((const char*)qsize.toAscii());
+	string csize(qs2utf8s(qsize));
 	char *cp;
 	size = strtoll(csize.c_str(), &cp, 10);
 	if (*cp != 0) {
diff --git a/src/qtgui/advsearch_w.h b/src/qtgui/advsearch_w.h
index c988a337..1e7920e6 100644
--- a/src/qtgui/advsearch_w.h
+++ b/src/qtgui/advsearch_w.h
@@ -19,8 +19,8 @@
 
 #include <vector>
 
-#include <qvariant.h>
-#include <qdialog.h>
+#include <QVariant>
+#include <QDialog>
 
 #include "searchclause_w.h"
 #include "recoll.h"
diff --git a/src/qtgui/advshist.cpp b/src/qtgui/advshist.cpp
index 5f08d18f..d3e0d212 100644
--- a/src/qtgui/advshist.cpp
+++ b/src/qtgui/advshist.cpp
@@ -77,7 +77,7 @@ bool SDHXMLHandler::startElement(const QString & /* namespaceURI */,
 				const QXmlAttributes &)
 {
     LOGDEB2(("SDHXMLHandler::startElement: name [%s]\n", 
-	     (const char *)qName.toAscii()));
+	     (const char *)qName.toUtf8()));
     if (qName == "SD") {
 	resetTemps();
 	// A new search descriptor. Allocate data structure
@@ -95,7 +95,7 @@ bool SDHXMLHandler::endElement(const QString & /* namespaceURI */,
 			      const QString &qName)
 {
     LOGDEB2(("SDHXMLHandler::endElement: name [%s]\n", 
-	     (const char *)qName.toAscii()));
+	     (const char *)qName.toUtf8()));
 
     if (qName == "CLT") {
 	if (currentText == "OR") {
@@ -110,7 +110,7 @@ bool SDHXMLHandler::endElement(const QString & /* namespaceURI */,
     } else if (qName == "T") {
 	text = base64_decode(qs2utf8s(currentText.trimmed()));
     } else if (qName == "S") {
-	slack = atoi((const char *)currentText.toAscii());
+	slack = atoi((const char *)currentText.toUtf8());
     } else if (qName == "C") {
 	SearchDataClause *c;
 	if (whatclause == "AND" || whatclause.isEmpty()) {
@@ -144,11 +144,11 @@ bool SDHXMLHandler::endElement(const QString & /* namespaceURI */,
 	slack = 0;
 	exclude = false;
     } else if (qName == "D") {
-	d = atoi((const char *)currentText.toAscii());
+	d = atoi((const char *)currentText.toUtf8());
     } else if (qName == "M") {
-	m = atoi((const char *)currentText.toAscii());
+	m = atoi((const char *)currentText.toUtf8());
     } else if (qName == "Y") {
-	y = atoi((const char *)currentText.toAscii());
+	y = atoi((const char *)currentText.toUtf8());
     } else if (qName == "DMI") {
 	di.d1 = d;
 	di.m1 = m;
@@ -160,28 +160,28 @@ bool SDHXMLHandler::endElement(const QString & /* namespaceURI */,
 	di.y2 = y;
 	hasdates = true;
     } else if (qName == "MIS") {
-	sd->setMinSize(atoll((const char *)currentText.toAscii()));
+	sd->setMinSize(atoll((const char *)currentText.toUtf8()));
     } else if (qName == "MAS") {
-	sd->setMaxSize(atoll((const char *)currentText.toAscii()));
+	sd->setMaxSize(atoll((const char *)currentText.toUtf8()));
     } else if (qName == "ST") {
-	string types = (const char *)currentText.toAscii();
+	string types = (const char *)currentText.toUtf8();
 	vector<string> vt;
 	stringToTokens(types, vt);
 	for (unsigned int i = 0; i < vt.size(); i++) 
 	    sd->addFiletype(vt[i]);
     } else if (qName == "IT") {
-	string types = (const char *)currentText.toAscii();
+	string types(qs2utf8s(currentText));
 	vector<string> vt;
 	stringToTokens(types, vt);
 	for (unsigned int i = 0; i < vt.size(); i++) 
 	    sd->remFiletype(vt[i]);
     } else if (qName == "YD") {
 	string d;
-	base64_decode((const char*)currentText.trimmed().toAscii(), d);
+	base64_decode(qs2utf8s(currentText.trimmed()), d);
 	sd->addClause(new SearchDataClausePath(d));
     } else if (qName == "ND") {
 	string d;
-	base64_decode((const char*)currentText.trimmed().toAscii(), d);
+	base64_decode(qs2utf8s(currentText.trimmed()), d);
 	sd->addClause(new SearchDataClausePath(d, true));
     } else if (qName == "SD") {
 	// Closing current search descriptor. Finishing touches...
diff --git a/src/qtgui/confgui/confgui.cpp b/src/qtgui/confgui/confgui.cpp
index 46a16597..131adf5c 100644
--- a/src/qtgui/confgui/confgui.cpp
+++ b/src/qtgui/confgui/confgui.cpp
@@ -174,7 +174,7 @@ ConfParamCStrW::ConfParamCStrW(QWidget *parent, ConfLink cflink,
     if (!createCommon(lbltxt, tltptxt))
 	return;
     m_cmb = new QComboBox(this);
-    m_cmb->setEditable(FALSE);
+    m_cmb->setEditable(false);
     m_cmb->insertItems(0, sl);
 
     setSzPol(m_cmb, QSizePolicy::Preferred, QSizePolicy::Fixed, 1, 0);
@@ -449,7 +449,7 @@ void ConfParamCSLW::showInputDialog()
 				       "", // label, 
 				       m_sl, // items, 
 				       0, // current = 0
-				       FALSE, // editable = true, 
+				       false, // editable = true, 
 				       &ok);
 
     if (ok && !s.isEmpty()) {
diff --git a/src/qtgui/crontool.cpp b/src/qtgui/crontool.cpp
index bde1d0a9..cfb31b66 100644
--- a/src/qtgui/crontool.cpp
+++ b/src/qtgui/crontool.cpp
@@ -59,9 +59,9 @@ void CronToolW::init()
     string id = idstring(theconfig->getConfDir());
     vector<string> sched;
     if (getCrontabSched(marker, id, sched)) {
-	minsLE->setText(QString::fromAscii(sched[0].c_str()));
-	hoursLE->setText(QString::fromAscii(sched[1].c_str()));
-	daysLE->setText(QString::fromAscii(sched[4].c_str()));
+        minsLE->setText(QString::fromUtf8(sched[0].c_str()));
+        hoursLE->setText(QString::fromUtf8(sched[1].c_str()));
+        daysLE->setText(QString::fromUtf8(sched[4].c_str()));
     }
 }
 
@@ -88,9 +88,9 @@ void CronToolW::changeCron(bool enable)
 	editCrontab(marker, id, "", "", reason);
 	accept();
     } else {
-	string mins((const char *)minsLE->text().toAscii());
-	string hours((const char *)hoursLE->text().toAscii());
-	string days((const char *)daysLE->text().toAscii());
+        string mins(qs2utf8s(minsLE->text()));
+        string hours(qs2utf8s(hoursLE->text()));
+        string days(qs2utf8s(daysLE->text()));
 	string sched = mins + " " + hours + "  * * " + days;
 	if (editCrontab(marker, id, sched, cmd, reason)) {
 	    accept();
diff --git a/src/qtgui/fragbuts.cpp b/src/qtgui/fragbuts.cpp
index 2b1fb075..ef6ff1ee 100644
--- a/src/qtgui/fragbuts.cpp
+++ b/src/qtgui/fragbuts.cpp
@@ -22,13 +22,13 @@
 #include <string>
 #include <vector>
 
-#include <QtGui/QHBoxLayout>
-#include <QtGui/QVBoxLayout>
-#include <QtGui/QCheckBox>
-#include <QtGui/QRadioButton>
-#include <QtGui/QButtonGroup>
-#include <QtGui/QMessageBox>
-#include <QtXml/QXmlDefaultHandler>
+#include <QHBoxLayout>
+#include <QVBoxLayout>
+#include <QCheckBox>
+#include <QRadioButton>
+#include <QButtonGroup>
+#include <QMessageBox>
+#include <QXmlDefaultHandler>
 
 #include "fragbuts.h"
 #include "pathut.h"
diff --git a/src/qtgui/guiutils.cpp b/src/qtgui/guiutils.cpp
index 7f3720e9..2fbba1c8 100644
--- a/src/qtgui/guiutils.cpp
+++ b/src/qtgui/guiutils.cpp
@@ -87,7 +87,7 @@ void rwSettings(bool writing)
 	     it != prefs.advSearchClauses.end(); it++) {
 	    char buf[20];
 	    sprintf(buf, "%d ", *it);
-	    advSearchClauses += QString::fromAscii(buf);
+	    advSearchClauses += QString::fromUtf8(buf);
 	}
     }
     SETTING_RW(advSearchClauses, "/Recoll/prefs/adv/clauseList", String, ascdflt);
@@ -139,7 +139,7 @@ void rwSettings(bool writing)
     SETTING_RW(prefs.reslistfontsize, "/Recoll/prefs/reslist/fontSize", Int, 
 	       10);
 
-    QString rlfDflt = QString::fromAscii(prefs.dfltResListFormat);
+    QString rlfDflt = QString::fromUtf8(prefs.dfltResListFormat);
     if (writing) {
 	if (prefs.reslistformat.compare(rlfDflt)) {
 	    settings.setValue("/Recoll/prefs/reslist/format", 
@@ -236,7 +236,7 @@ void rwSettings(bool writing)
 	     it != prefs.restableColWidths.end(); it++) {
 	    char buf[20];
 	    sprintf(buf, "%d ", *it);
-	    rtcw += QString::fromAscii(buf);
+	    rtcw += QString::fromUtf8(buf);
 	}
     }
     SETTING_RW(rtcw, "/Recoll/prefs/query/restableWidths", String, 
@@ -387,7 +387,7 @@ void rwSettings(bool writing)
 
 string PrefsPack::stemlang()
 {
-    string stemLang = (const char *)prefs.queryStemLang.toAscii();
+    string stemLang(qs2utf8s(prefs.queryStemLang));
     if (stemLang == "ALL") {
 	if (theconfig)
 	    theconfig->getConfParam("indexstemminglanguages", stemLang);
diff --git a/src/qtgui/main.cpp b/src/qtgui/main.cpp
index 18d03a34..d21054cb 100644
--- a/src/qtgui/main.cpp
+++ b/src/qtgui/main.cpp
@@ -188,7 +188,7 @@ void applyStyleSheet(const QString& ssfname)
     if (cfname && *cfname) {
 	string stylesheet;
 	file_to_string(cfname, stylesheet);
-	qApp->setStyleSheet(QString::fromAscii(stylesheet.c_str()));
+	qApp->setStyleSheet(QString::fromUtf8(stylesheet.c_str()));
     } else {
 	qApp->setStyleSheet(QString());
     }
diff --git a/src/qtgui/preview_w.cpp b/src/qtgui/preview_w.cpp
index dab97b3b..887e1831 100644
--- a/src/qtgui/preview_w.cpp
+++ b/src/qtgui/preview_w.cpp
@@ -201,8 +201,8 @@ void Preview::init()
     QWidget *unnamed = new QWidget(pvTab);
     QVBoxLayout *unnamedLayout = new QVBoxLayout(unnamed);
     PreviewTextEdit *pvEdit = new PreviewTextEdit(unnamed, "pvEdit", this);
-    pvEdit->setReadOnly(TRUE);
-    pvEdit->setUndoRedoEnabled(FALSE);
+    pvEdit->setReadOnly(true);
+    pvEdit->setUndoRedoEnabled(false);
     unnamedLayout->addWidget(pvEdit);
     pvTab->addTab(unnamed, "");
 
@@ -232,13 +232,13 @@ void Preview::init()
     layout3->addWidget(searchTextCMB);
 
     nextButton = new QPushButton(this);
-    nextButton->setEnabled(TRUE);
+    nextButton->setEnabled(true);
     layout3->addWidget(nextButton);
     prevButton = new QPushButton(this);
-    prevButton->setEnabled(TRUE);
+    prevButton->setEnabled(true);
     layout3->addWidget(prevButton);
     clearPB = new QPushButton(this);
-    clearPB->setEnabled(FALSE);
+    clearPB->setEnabled(false);
     layout3->addWidget(clearPB);
     matchCheck = new QCheckBox(this);
     layout3->addWidget(matchCheck);
@@ -397,7 +397,7 @@ bool Preview::eventFilter(QObject *target, QEvent *event)
 void Preview::searchTextChanged(const QString & text)
 {
     LOGDEB1(("Search line text changed. text: '%s'\n", 
-	     (const char *)text.toAscii()));
+	     (const char *)text.toUtf8()));
     m_searchTextFromIndex = -1;
     if (text.isEmpty()) {
 	m_dynSearchActive = false;
@@ -581,8 +581,8 @@ PreviewTextEdit *Preview::addEditorTab()
     QWidget *anon = new QWidget((QWidget *)pvTab);
     QVBoxLayout *anonLayout = new QVBoxLayout(anon); 
     PreviewTextEdit *editor = new PreviewTextEdit(anon, "pvEdit", this);
-    editor->setReadOnly(TRUE);
-    editor->setUndoRedoEnabled(FALSE );
+    editor->setReadOnly(true);
+    editor->setUndoRedoEnabled(false );
     anonLayout->addWidget(editor);
     pvTab->addTab(anon, "Tab");
     pvTab->setCurrentIndex(pvTab->count() -1);
@@ -811,7 +811,7 @@ bool Preview::loadDocInCurrentTab(const Rcl::Doc &idoc, int docnum)
 
     QString msg = QString("Loading: %1 (size %2 bytes)")
 	.arg(QString::fromLocal8Bit(idoc.url.c_str()))
-	.arg(QString::fromAscii(idoc.fbytes.c_str()));
+	.arg(QString::fromUtf8(idoc.fbytes.c_str()));
 
     // Create progress dialog and aux objects
     const int nsteps = 20;
@@ -848,7 +848,7 @@ bool Preview::loadDocInCurrentTab(const Rcl::Doc &idoc, int docnum)
     if (status != 0) {
         QString explain;
 	if (!lthr.missing.empty()) {
-            explain = QString::fromAscii("<br>") +
+            explain = QString::fromUtf8("<br>") +
                 tr("Missing helper program: ") +
                 QString::fromLocal8Bit(lthr.missing.c_str());
 	    QMessageBox::warning(0, "Recoll",
diff --git a/src/qtgui/rclmain.ui b/src/qtgui/rclmain.ui
index 195bddef..025927f7 100644
--- a/src/qtgui/rclmain.ui
+++ b/src/qtgui/rclmain.ui
@@ -60,14 +60,6 @@
   </widget>
   <widget class="QStatusBar" name="statusbar"/>
   <widget class="QMenuBar" name="MenuBar">
-   <property name="geometry">
-    <rect>
-     <x>0</x>
-     <y>0</y>
-     <width>800</width>
-     <height>25</height>
-    </rect>
-   </property>
    <widget class="QMenu" name="fileMenu">
     <property name="title">
      <string>&amp;File</string>
diff --git a/src/qtgui/rclmain_w.cpp b/src/qtgui/rclmain_w.cpp
index e0dfcdfe..0678f3a6 100644
--- a/src/qtgui/rclmain_w.cpp
+++ b/src/qtgui/rclmain_w.cpp
@@ -197,7 +197,7 @@ void RclMain::init()
     QAction *id; 
     for (vector<string>::const_iterator it = langs.begin(); 
 	 it != langs.end(); it++) {
-	QString qlang = QString::fromAscii(it->c_str(), it->length());
+	QString qlang = QString::fromUtf8(it->c_str(), it->length());
 	id = preferencesMenu->addAction(qlang);
 	id->setCheckable(true);
 	m_stemLangToId[qlang] = id;
@@ -222,7 +222,7 @@ void RclMain::init()
     // Document filter buttons and combobox
     // Combobox version of the document filter control
     m_filtCMB = new QComboBox(m_resTB);
-    m_filtCMB->setEditable(FALSE);
+    m_filtCMB->setEditable(false);
     m_filtCMB->addItem(tr("All"));
     m_filtCMB->setToolTip(tr("Document filter"));
     // Buttons version of the document filter control
@@ -449,8 +449,8 @@ void RclMain::init()
         m_trayicon = 0;
     }
 
-    fileRebuildIndexAction->setEnabled(FALSE);
-    fileToggleIndexingAction->setEnabled(FALSE);
+    fileRebuildIndexAction->setEnabled(false);
+    fileToggleIndexingAction->setEnabled(false);
     // Start timer on a slow period (used for checking ^C). Will be
     // speeded up during indexing
     periodictimer->start(1000);
@@ -635,7 +635,7 @@ void RclMain::setStemLang(QAction *id)
     }
     prefs.queryStemLang = lang;
     LOGDEB(("RclMain::setStemLang(%d): lang [%s]\n", 
-	    id, (const char *)prefs.queryStemLang.toAscii()));
+	    id, (const char *)prefs.queryStemLang.toUtf8()));
     rwSettings(true);
     emit stemLangChanged(lang);
 }
@@ -643,7 +643,7 @@ void RclMain::setStemLang(QAction *id)
 // Set the checked stemming language item before showing the prefs menu
 void RclMain::setStemLang(const QString& lang)
 {
-    LOGDEB(("RclMain::setStemLang(%s)\n", (const char *)lang.toAscii()));
+    LOGDEB(("RclMain::setStemLang(%s)\n", (const char *)lang.toUtf8()));
     QAction *id;
     if (lang == "") {
 	id = m_idNoStem;
@@ -741,7 +741,7 @@ void RclMain::idxStatus()
 		    status.dbtotdocs);
 	else
 	    sprintf(cnts, "(%d/%d) ", status.docsdone, status.filesdone);
-	msg += QString::fromAscii(cnts) + " ";
+	msg += QString::fromUtf8(cnts) + " ";
     }
     string mf;int ecnt = 0;
     string fcharset = theconfig->getDefCharset(true);
@@ -792,23 +792,23 @@ void RclMain::periodic100()
     if (m_idxproc) {
 	m_indexerState = IXST_RUNNINGMINE;
 	fileToggleIndexingAction->setText(tr("Stop &Indexing"));
-	fileToggleIndexingAction->setEnabled(TRUE);
-	fileRebuildIndexAction->setEnabled(FALSE);
+	fileToggleIndexingAction->setEnabled(true);
+	fileRebuildIndexAction->setEnabled(false);
 	periodictimer->setInterval(200);
     } else {
 	Pidfile pidfile(theconfig->getPidfile());
 	if (pidfile.open() == 0) {
 	    m_indexerState = IXST_NOTRUNNING;
 	    fileToggleIndexingAction->setText(tr("Update &Index"));
-	    fileToggleIndexingAction->setEnabled(TRUE);
-	    fileRebuildIndexAction->setEnabled(TRUE);
+	    fileToggleIndexingAction->setEnabled(true);
+	    fileRebuildIndexAction->setEnabled(true);
 	    periodictimer->setInterval(1000);
 	} else {
 	    // Real time or externally started batch indexer running
 	    m_indexerState = IXST_RUNNINGNOTMINE;
 	    fileToggleIndexingAction->setText(tr("Stop &Indexing"));
-	    fileToggleIndexingAction->setEnabled(TRUE);
-	    fileRebuildIndexAction->setEnabled(FALSE);
+	    fileToggleIndexingAction->setEnabled(true);
+	    fileRebuildIndexAction->setEnabled(false);
 	    periodictimer->setInterval(200);
 	}	    
     }
@@ -1272,7 +1272,7 @@ void RclMain::showMissingHelpers()
 	QMessageBox::information(this, "", tr("Indexing did not run yet"));
 	return;
     }
-    QString msg = QString::fromAscii("<p>") +
+    QString msg = QString::fromUtf8("<p>") +
 	tr("External applications/commands needed for your file types "
 	   "and not found, as stored by the last indexing pass in ");
     msg += "<i>";
@@ -1347,12 +1347,12 @@ void RclMain::showActiveTypes()
     // We replace the list with an editor so that the user can copy/paste
     delete dialog.listWidget;
     QTextEdit *editor = new QTextEdit(dialog.groupBox);
-    editor->setReadOnly(TRUE);
+    editor->setReadOnly(true);
     dialog.horizontalLayout->addWidget(editor);
 
     for (set<string>::const_iterator it = mtypesfromdbconf.begin(); 
 	 it != mtypesfromdbconf.end(); it++) {
-	editor->append(QString::fromAscii(it->c_str()));
+	editor->append(QString::fromUtf8(it->c_str()));
     }
     editor->moveCursor(QTextCursor::Start);
     editor->ensureCursorVisible();
@@ -1528,7 +1528,7 @@ void RclMain::updateIdxForDocs(vector<Rcl::Doc>& docs)
 	m_idxproc->startExec("recollindex", args, false, false);
 	fileToggleIndexingAction->setText(tr("Stop &Indexing"));
     }
-    fileToggleIndexingAction->setEnabled(FALSE);
+    fileToggleIndexingAction->setEnabled(false);
 }
 
 /** 
@@ -1773,7 +1773,7 @@ void RclMain::newDupsW(const Rcl::Doc, const vector<Rcl::Doc> dups)
     // We replace the list with an editor so that the user can copy/paste
     delete dialog.listWidget;
     QTextEdit *editor = new QTextEdit(dialog.groupBox);
-    editor->setReadOnly(TRUE);
+    editor->setReadOnly(true);
     dialog.horizontalLayout->addWidget(editor);
 
     for (vector<Rcl::Doc>::const_iterator it = dups.begin(); 
@@ -1839,7 +1839,7 @@ void RclMain::openWith(Rcl::Doc doc, string cmdspec)
 	QMessageBox::warning(0, "Recoll", 
 			     tr("Bad desktop app spec for %1: [%2]\n"
 				"Please check the desktop file")
-			     .arg(QString::fromAscii(doc.mimetype.c_str()))
+			     .arg(QString::fromUtf8(doc.mimetype.c_str()))
 			     .arg(QString::fromLocal8Bit(cmdspec.c_str())));
 	return;
     }
@@ -1896,7 +1896,7 @@ void RclMain::startNativeViewer(Rcl::Doc doc, int pagenum, QString term)
 	QMessageBox::warning(0, "Recoll", 
 			     tr("Bad viewer command line for %1: [%2]\n"
 				"Please check the mimeview file")
-			     .arg(QString::fromAscii(doc.mimetype.c_str()))
+			     .arg(QString::fromUtf8(doc.mimetype.c_str()))
 			     .arg(QString::fromLocal8Bit(cmd.c_str())));
 	return;
     }
@@ -1928,7 +1928,7 @@ void RclMain::startNativeViewer(Rcl::Doc doc, int pagenum, QString term)
 
     // Command not found: start the user dialog to help find another one:
     if (execpath.empty()) {
-	QString mt = QString::fromAscii(doc.mimetype.c_str());
+	QString mt = QString::fromUtf8(doc.mimetype.c_str());
 	QString message = tr("The viewer specified in mimeview for %1: %2"
 			     " is not found.\nDo you want to start the "
 			     " preferences dialog ?")
@@ -1969,7 +1969,7 @@ void RclMain::startNativeViewer(Rcl::Doc doc, int pagenum, QString term)
 	QMessageBox::warning(0, "Recoll", 
 			     tr("Viewer command line for %1 specifies both "
 				"file and parent file value: unsupported")
-			     .arg(QString::fromAscii(doc.mimetype.c_str())));
+			     .arg(QString::fromUtf8(doc.mimetype.c_str())));
 	return;
     }
 	
diff --git a/src/qtgui/recoll.pro.in b/src/qtgui/recoll.pro.in
index 36f03b8f..e06aec8d 100644
--- a/src/qtgui/recoll.pro.in
+++ b/src/qtgui/recoll.pro.in
@@ -8,6 +8,7 @@ LANGUAGE        = C++
 @QMAKE_ENABLE_ZEITGEIST@QMAKE_CXXFLAGS += -DUSE_ZEITGEIST
 
 QT += xml
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets webkitwidgets
 
 CONFIG  += qt warn_on thread release 
 
diff --git a/src/qtgui/reslist.cpp b/src/qtgui/reslist.cpp
index 96ae5073..4c39ed85 100644
--- a/src/qtgui/reslist.cpp
+++ b/src/qtgui/reslist.cpp
@@ -35,7 +35,7 @@
 #include <QTextBlock>
 #include <QShortcut>
 #ifndef __APPLE__
-#include <qx11info_x11.h>
+//#include <qx11info_x11.h>
 #endif
 
 #include "debuglog.h"
@@ -288,7 +288,7 @@ public:
 	}
 		
 	return string("<span class='rclmatch' style='color: ")
-	    + string((const char *)prefs.qtermcolor.toAscii()) + string("'>");
+	    + qs2utf8s(prefs.qtermcolor) + string("'>");
     }
     virtual string endMatch() 
     {
@@ -329,8 +329,7 @@ ResList::ResList(QWidget* parent, const char* name)
     languageChange();
 
     (void)new HelpClient(this);
-    HelpClient::installMap((const char *)this->objectName().toAscii(), 
-			   "RCL.SEARCH.RESLIST");
+    HelpClient::installMap(qs2utf8s(this->objectName()), "RCL.SEARCH.RESLIST");
 
 #if 0
     // See comments in "highlighted
@@ -465,7 +464,7 @@ void ResList::resetView()
     QTextBrowser::append(".");
     clear();
 #ifndef __APPLE__
-    XFlush(QX11Info::display());
+//    XFlush(QX11Info::display());
 #endif
 #else
     m_text = "";
@@ -786,7 +785,7 @@ void ResList::previewExposed(int docnum)
 	QString sel = 
 	   QString("div[rcldocnum=\"%1\"]").arg(m_curPvDoc - pageFirstDocNum());
 	LOGDEB2(("Searching for element, selector: [%s]\n", 
-		 (const char *)sel.toAscii()));
+			 qs2utf8s(sel).c_str()));
 	QWebElement elt = page()->mainFrame()->findFirstElement(sel);
 	if (!elt.isNull()) {
 	    LOGDEB2(("Found\n"));
@@ -823,7 +822,7 @@ void ResList::previewExposed(int docnum)
     QString sel = 
 	QString("div[rcldocnum=\"%1\"]").arg(docnum - pageFirstDocNum());
     LOGDEB2(("Searching for element, selector: [%s]\n", 
-	    (const char *)sel.toAscii()));
+			 qs2utf8s(sel).c_str()));
     QWebElement elt = page()->mainFrame()->findFirstElement(sel);
     if (!elt.isNull()) {
 	LOGDEB2(("Found\n"));
@@ -860,7 +859,7 @@ void ResList::showQueryDetails()
 
 void ResList::linkWasClicked(const QUrl &url)
 {
-    string ascurl = (const char *)url.toString().toAscii();;
+    string ascurl = qs2utf8s(url.toString());
     LOGDEB(("ResList::linkWasClicked: [%s]\n", ascurl.c_str()));
 
     int what = ascurl[0];
diff --git a/src/qtgui/reslist.h b/src/qtgui/reslist.h
index 346c54ef..0f627a4d 100644
--- a/src/qtgui/reslist.h
+++ b/src/qtgui/reslist.h
@@ -30,7 +30,7 @@ using std::pair;
 #include <QTextBrowser>
 #define RESLIST_PARENTCLASS QTextBrowser
 #else
-#include <QtWebKit/QWebView>
+#include <QWebView>
 #define RESLIST_PARENTCLASS QWebView
 #endif
 
diff --git a/src/qtgui/restable.cpp b/src/qtgui/restable.cpp
index 091db991..b85da2f2 100644
--- a/src/qtgui/restable.cpp
+++ b/src/qtgui/restable.cpp
@@ -67,7 +67,7 @@ public:
     virtual string startMatch(unsigned int) 
     {
 	return string("<span style='color: ")
-	    + string((const char *)prefs.qtermcolor.toAscii()) + string("'>");
+	    + qs2utf8s(prefs.qtermcolor) + string("'>");
     }
     virtual string endMatch() {return string("</span>");}
 };
@@ -286,7 +286,8 @@ int RecollModel::columnCount(const QModelIndex&) const
 void RecollModel::readDocSource()
 {
     LOGDEB(("RecollModel::readDocSource()\n"));
-    reset();
+    beginResetModel();
+    endResetModel();
 }
 
 void RecollModel::setDocSource(RefCntr<DocSequence> nsource)
@@ -459,8 +460,8 @@ public:
 		    pen.setBrush(opt.palette.brush(QPalette::HighlightedText));
 		    painter->setPen(pen);
 #else
-		    text = QString::fromAscii("<div style='color: white'> ") + 
-			text + QString::fromAscii("</div>");
+		    text = QString::fromUtf8("<div style='color: white'> ") + 
+			text + QString::fromUtf8("</div>");
 #endif
 		} 
 		painter->setClipRect(option.rect);
@@ -508,7 +509,11 @@ void ResTable::init()
 	connect(header, SIGNAL(customContextMenuRequested(const QPoint&)),
 		this, SLOT(createHeaderPopupMenu(const QPoint&)));
     }
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+    header->setSectionsMovable(true);
+#else
     header->setMovable(true);
+#endif
 
     header = tableView->verticalHeader();
     if (header) {
@@ -540,9 +545,9 @@ void ResTable::init()
 
     delete textBrowser;
     m_detail = new ResTableDetailArea(this);
-    m_detail->setReadOnly(TRUE);
-    m_detail->setUndoRedoEnabled(FALSE);
-    m_detail->setOpenLinks(FALSE);
+    m_detail->setReadOnly(true);
+    m_detail->setUndoRedoEnabled(false);
+    m_detail->setOpenLinks(false);
     // signals and slots connections
     connect(m_detail, SIGNAL(anchorClicked(const QUrl &)), 
 	    this, SLOT(linkWasClicked(const QUrl &)));
@@ -755,7 +760,7 @@ void ResTable::linkWasClicked(const QUrl &url)
 	return;
     }
     QString s = url.toString();
-    const char *ascurl = s.toAscii();
+    const char *ascurl = s.toUtf8();
     LOGDEB(("ResTable::linkWasClicked: [%s]\n", ascurl));
 
     int i = atoi(ascurl+1) -1;
diff --git a/src/qtgui/snippets_w.cpp b/src/qtgui/snippets_w.cpp
index 36cc7eae..d439851f 100644
--- a/src/qtgui/snippets_w.cpp
+++ b/src/qtgui/snippets_w.cpp
@@ -54,7 +54,7 @@ public:
     virtual string startMatch(unsigned int)
     {
 	return string("<span class='rclmatch' style='color: ")
-	    + string((const char *)prefs.qtermcolor.toAscii()) + string("'>");
+	    + qs2utf8s(prefs.qtermcolor) + string("'>");
     }
     virtual string endMatch() 
     {
diff --git a/src/qtgui/spell_w.cpp b/src/qtgui/spell_w.cpp
index b5d3548a..c8fad345 100644
--- a/src/qtgui/spell_w.cpp
+++ b/src/qtgui/spell_w.cpp
@@ -93,7 +93,7 @@ void SpellW::init()
     for (vector<string>::const_iterator it = langs.begin(); 
 	 it != langs.end(); it++) {
 	stemLangCMB->
-	    addItem(QString::fromAscii(it->c_str(), it->length()));
+	    addItem(QString::fromUtf8(it->c_str(), it->length()));
     }
 
     (void)new HelpClient(this);
@@ -109,7 +109,11 @@ void SpellW::init()
     connect(expTypeCMB, SIGNAL(activated(int)), this, SLOT(modeSet(int)));
 
     resTW->setShowGrid(0);
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+    resTW->horizontalHeader()->setSectionResizeMode(0, QHeaderView::Stretch);
+#else
     resTW->horizontalHeader()->setResizeMode(0, QHeaderView::Stretch);
+#endif
     resTW->verticalHeader()->setDefaultSectionSize(20); 
     connect(resTW,
 	   SIGNAL(cellDoubleClicked(int, int)),
@@ -260,7 +264,7 @@ void SpellW::doExpand()
             resTW->setItem(row, 0, 
                     new QTableWidgetItem(QString::fromUtf8(it->term.c_str()))); 
             resTW->setItem(row++, 1, 
-                             new QTableWidgetItem(QString::fromAscii(num)));
+                             new QTableWidgetItem(QString::fromUtf8(num)));
 	}
     }
 }
diff --git a/src/qtgui/ssearch_w.cpp b/src/qtgui/ssearch_w.cpp
index f6cdb643..2048123a 100644
--- a/src/qtgui/ssearch_w.cpp
+++ b/src/qtgui/ssearch_w.cpp
@@ -243,7 +243,7 @@ bool SSearch::startSimpleSearch(const string& u8, int maxexp)
             sdata = wasaStringToRcl(theconfig, stemlang, u8, reason);
 	if (sdata == 0) {
 	    QMessageBox::warning(0, "Recoll", tr("Bad query string") + ": " +
-				 QString::fromAscii(reason.c_str()));
+				 QString::fromUtf8(reason.c_str()));
 	    return false;
 	}
     } else {
diff --git a/src/qtgui/uiprefs_w.cpp b/src/qtgui/uiprefs_w.cpp
index ab7d43bd..1b7dc0fa 100644
--- a/src/qtgui/uiprefs_w.cpp
+++ b/src/qtgui/uiprefs_w.cpp
@@ -184,8 +184,8 @@ void UIPrefsDialog::setFromPrefs()
     for (vector<string>::const_iterator it = langs.begin(); 
 	 it != langs.end(); it++) {
 	stemLangCMB->
-	    addItem(QString::fromAscii(it->c_str(), it->length()));
-	if (cur == 0 && !strcmp((const char*)prefs.queryStemLang.toAscii(), 
+	    addItem(QString::fromUtf8(it->c_str(), it->length()));
+	if (cur == 0 && !strcmp((const char*)prefs.queryStemLang.toUtf8(), 
 				it->c_str())) {
 	    cur = stemLangCMB->count();
 	}
diff --git a/src/qtgui/viewaction_w.cpp b/src/qtgui/viewaction_w.cpp
index 57be2c3f..e3cb4792 100644
--- a/src/qtgui/viewaction_w.cpp
+++ b/src/qtgui/viewaction_w.cpp
@@ -88,12 +88,12 @@ void ViewAction::fillLists()
     for (vector<pair<string, string> >::const_iterator it = defs.begin();
 	 it != defs.end(); it++) {
 	actionsLV->setItem(row, 0, 
-	   new QTableWidgetItem(QString::fromAscii(it->first.c_str())));
+	   new QTableWidgetItem(QString::fromUtf8(it->first.c_str())));
 	if (!prefs.useDesktopOpen ||
 	    viewerXs.find(it->first) != viewerXs.end()) {
 	    actionsLV->setItem(
 		row, 1, 
-		new QTableWidgetItem(QString::fromAscii(it->second.c_str())));
+		new QTableWidgetItem(QString::fromUtf8(it->second.c_str())));
 	} else {
 	    actionsLV->setItem(
 		row, 1, new QTableWidgetItem(tr("Desktop Default")));
@@ -119,7 +119,6 @@ void ViewAction::selectMT(const QString& mt)
 
 void ViewAction::onSelSameClicked()
 {
-    fprintf(stderr, "onSelSameClicked()\n");
     actionsLV->clearSelection();
     QString value = currentLBL->text();
     if (value.isEmpty())
@@ -131,7 +130,7 @@ void ViewAction::onSelSameClicked()
     for (unsigned int i = 0; i < defs.size(); i++) {
 	if (defs[i].second == action) {
 	    QList<QTableWidgetItem *>items = 
-		actionsLV->findItems(QString::fromAscii(defs[i].first.c_str()), 
+		actionsLV->findItems(QString::fromUtf8(defs[i].first.c_str()), 
 				  Qt::MatchFixedString|Qt::MatchCaseSensitive);
 	    for (QList<QTableWidgetItem *>::iterator it = items.begin();
 		 it != items.end(); it++) {
@@ -153,7 +152,7 @@ void ViewAction::onItemClicked(QTableWidgetItem * item)
     theconfig->getMimeViewerDefs(defs);
     for (unsigned int i = 0; i < defs.size(); i++) {
 	if (defs[i].first == mtype) {
-	    currentLBL->setText(QString::fromAscii(defs[i].second.c_str()));
+	    currentLBL->setText(QString::fromUtf8(defs[i].second.c_str()));
 	    selSamePB->setEnabled(true);
 	    return;
 	}