diff --git a/src/app/application.cpp b/src/app/application.cpp
index 127aaab28..c87a430e2 100644
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@@ -357,7 +357,7 @@ void Application::initializeTranslation()
     }
 
     if (m_qtTranslator.load(
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
             QString::fromUtf8("qtbase_") + locale, QLibraryInfo::location(QLibraryInfo::TranslationsPath)) ||
         m_qtTranslator.load(
 #endif
diff --git a/src/app/main.cpp b/src/app/main.cpp
index e14bff9cb..9bfe0d6ee 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -42,7 +42,7 @@
 #include <QSplashScreen>
 #ifdef QBT_STATIC_QT
 #include <QtPlugin>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 Q_IMPORT_PLUGIN(QICOPlugin)
 #else
 Q_IMPORT_PLUGIN(qico)
diff --git a/src/core/http/requestparser.cpp b/src/core/http/requestparser.cpp
index ba083d2bf..eb26dbc5c 100644
--- a/src/core/http/requestparser.cpp
+++ b/src/core/http/requestparser.cpp
@@ -31,7 +31,7 @@
 
 #include <QStringList>
 #include <QUrl>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QUrlQuery>
 #endif
 #include <QDir>
@@ -117,7 +117,7 @@ bool RequestParser::parseStartingLine(const QString &line)
         m_request.path = url.path(); // Path
 
         // Parse GET parameters
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
         QListIterator<QPair<QString, QString> > i(url.queryItems());
 #else
         QListIterator<QPair<QString, QString> > i(QUrlQuery(url).queryItems());
@@ -216,7 +216,7 @@ bool RequestParser::parseContent(const QByteArray& data)
     // Parse url-encoded POST data
     if (m_request.headers["content-type"].startsWith("application/x-www-form-urlencoded")) {
         QUrl url;
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
         url.setEncodedQuery(data);
         QListIterator<QPair<QString, QString> > i(url.queryItems());
 #else
diff --git a/src/core/http/server.cpp b/src/core/http/server.cpp
index f9f58e10c..0895b5f57 100644
--- a/src/core/http/server.cpp
+++ b/src/core/http/server.cpp
@@ -67,7 +67,7 @@ void Server::disableHttps()
 }
 #endif
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 void Server::incomingConnection(qintptr socketDescriptor)
 #else
 void Server::incomingConnection(int socketDescriptor)
diff --git a/src/core/http/server.h b/src/core/http/server.h
index 87d62fe92..64920e2e8 100644
--- a/src/core/http/server.h
+++ b/src/core/http/server.h
@@ -59,7 +59,7 @@ namespace Http
     #endif
 
     private:
-    #if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+    #ifdef QBT_USES_QT5
         void incomingConnection(qintptr socketDescriptor);
     #else
         void incomingConnection(int socketDescriptor);
diff --git a/src/core/net/dnsupdater.cpp b/src/core/net/dnsupdater.cpp
index 0a410e66e..97dde9f30 100644
--- a/src/core/net/dnsupdater.cpp
+++ b/src/core/net/dnsupdater.cpp
@@ -32,7 +32,7 @@
 #include <QDebug>
 #include <QRegExp>
 #include <QStringList>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QUrlQuery>
 #endif
 
@@ -160,7 +160,7 @@ QUrl DNSUpdater::getUpdateUrl() const
     }
     url.setPath("/nic/update");
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     url.addQueryItem("hostname", m_domain);
     url.addQueryItem("myip", m_lastIP.toString());
 #else
diff --git a/src/core/net/private/geoipdatabase.cpp b/src/core/net/private/geoipdatabase.cpp
index 3c8ed6cce..6eaa5728e 100644
--- a/src/core/net/private/geoipdatabase.cpp
+++ b/src/core/net/private/geoipdatabase.cpp
@@ -66,7 +66,7 @@ namespace
         Float = 15
     };
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     Q_IPV6ADDR createMappedAddress(quint32 ip4);
 #endif
 }
@@ -166,7 +166,7 @@ QDateTime GeoIPDatabase::buildEpoch() const
 
 QString GeoIPDatabase::lookup(const QHostAddress &hostAddr) const
 {
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     Q_IPV6ADDR addr = hostAddr.protocol() == QAbstractSocket::IPv4Protocol
             ? createMappedAddress(hostAddr.toIPv4Address())
             : hostAddr.toIPv6Address();
@@ -499,7 +499,7 @@ QVariant GeoIPDatabase::readArrayValue(quint32 &offset, quint32 count) const
 
 namespace
 {
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     Q_IPV6ADDR createMappedAddress(quint32 ip4)
     {
         Q_IPV6ADDR ip6;
diff --git a/src/core/preferences.cpp b/src/core/preferences.cpp
index 91cb2daf7..08c6e5c36 100644
--- a/src/core/preferences.cpp
+++ b/src/core/preferences.cpp
@@ -1976,7 +1976,7 @@ void Preferences::setTrayIconStyle(TrayIcon::Style style)
 // in the same file.
 QByteArray Preferences::getAddNewTorrentDialogState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("AddNewTorrentDialog/qt5/treeHeaderState").toByteArray();
 #else
     return value("AddNewTorrentDialog/treeHeaderState").toByteArray();
@@ -1985,7 +1985,7 @@ QByteArray Preferences::getAddNewTorrentDialogState() const
 
 void Preferences::setAddNewTorrentDialogState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("AddNewTorrentDialog/qt5/treeHeaderState", state);
 #else
     setValue("AddNewTorrentDialog/treeHeaderState", state);
@@ -2074,7 +2074,7 @@ void Preferences::setMainGeometry(const QByteArray &geometry)
 
 QByteArray Preferences::getMainVSplitterState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("MainWindow/qt5/vsplitterState").toByteArray();
 #else
     return value("MainWindow/vsplitterState").toByteArray();
@@ -2083,7 +2083,7 @@ QByteArray Preferences::getMainVSplitterState() const
 
 void Preferences::setMainVSplitterState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("MainWindow/qt5/vsplitterState", state);
 #else
     setValue("MainWindow/vsplitterState", state);
@@ -2134,7 +2134,7 @@ void Preferences::setPrefHSplitterSizes(const QStringList &sizes)
 
 QByteArray Preferences::getPeerListState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("TorrentProperties/Peers/qt5/PeerListState").toByteArray();
 #else
     return value("TorrentProperties/Peers/PeerListState").toByteArray();
@@ -2143,7 +2143,7 @@ QByteArray Preferences::getPeerListState() const
 
 void Preferences::setPeerListState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("TorrentProperties/Peers/qt5/PeerListState", state);
 #else
     setValue("TorrentProperties/Peers/PeerListState", state);
@@ -2162,7 +2162,7 @@ void Preferences::setPropSplitterSizes(const QString &sizes)
 
 QByteArray Preferences::getPropFileListState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("TorrentProperties/qt5/FilesListState").toByteArray();
 #else
     return value("TorrentProperties/FilesListState").toByteArray();
@@ -2171,7 +2171,7 @@ QByteArray Preferences::getPropFileListState() const
 
 void Preferences::setPropFileListState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("TorrentProperties/qt5/FilesListState", state);
 #else
     setValue("TorrentProperties/FilesListState", state);
@@ -2200,7 +2200,7 @@ void Preferences::setPropVisible(const bool visible)
 
 QByteArray Preferences::getPropTrackerListState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("TorrentProperties/Trackers/qt5/TrackerListState").toByteArray();
 #else
     return value("TorrentProperties/Trackers/TrackerListState").toByteArray();
@@ -2209,7 +2209,7 @@ QByteArray Preferences::getPropTrackerListState() const
 
 void Preferences::setPropTrackerListState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("TorrentProperties/Trackers/qt5/TrackerListState", state);
 #else
     setValue("TorrentProperties/Trackers/TrackerListState", state);
@@ -2228,7 +2228,7 @@ void Preferences::setRssGeometry(const QByteArray &geometry)
 
 QByteArray Preferences::getRssHSplitterSizes() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("RssFeedDownloader/qt5/hsplitterSizes").toByteArray();
 #else
     return value("RssFeedDownloader/hsplitterSizes").toByteArray();
@@ -2237,7 +2237,7 @@ QByteArray Preferences::getRssHSplitterSizes() const
 
 void Preferences::setRssHSplitterSizes(const QByteArray &sizes)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("RssFeedDownloader/qt5/hsplitterSizes", sizes);
 #else
     setValue("RssFeedDownloader/hsplitterSizes", sizes);
@@ -2256,7 +2256,7 @@ void Preferences::setRssOpenFolders(const QStringList &folders)
 
 QByteArray Preferences::getRssHSplitterState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("Rss/qt5/splitter_h").toByteArray();
 #else
     return value("Rss/splitter_h").toByteArray();
@@ -2265,7 +2265,7 @@ QByteArray Preferences::getRssHSplitterState() const
 
 void Preferences::setRssHSplitterState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("Rss/qt5/splitter_h", state);
 #else
     setValue("Rss/splitter_h", state);
@@ -2274,7 +2274,7 @@ void Preferences::setRssHSplitterState(const QByteArray &state)
 
 QByteArray Preferences::getRssVSplitterState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("Rss/qt5/splitter_v").toByteArray();
 #else
     return value("Rss/splitter_v").toByteArray();
@@ -2283,7 +2283,7 @@ QByteArray Preferences::getRssVSplitterState() const
 
 void Preferences::setRssVSplitterState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("Rss/qt5/splitter_v", state);
 #else
     setValue("Rss/splitter_v", state);
@@ -2422,7 +2422,7 @@ void Preferences::setTransSelFilter(const int &index)
 
 QByteArray Preferences::getTransHeaderState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     return value("TransferList/qt5/HeaderState").toByteArray();
 #else
     return value("TransferList/HeaderState").toByteArray();
@@ -2431,7 +2431,7 @@ QByteArray Preferences::getTransHeaderState() const
 
 void Preferences::setTransHeaderState(const QByteArray &state)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     setValue("TransferList/qt5/HeaderState", state);
 #else
     setValue("TransferList/HeaderState", state);
diff --git a/src/core/utils/fs.cpp b/src/core/utils/fs.cpp
index 30728d501..da5349511 100644
--- a/src/core/utils/fs.cpp
+++ b/src/core/utils/fs.cpp
@@ -55,7 +55,7 @@
 #include <winbase.h>
 #endif
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
 
 #ifndef DISABLE_GUI
 #include <QDesktopServices>
@@ -182,7 +182,7 @@ bool Utils::Fs::forceRemove(const QString& file_path)
  */
 void Utils::Fs::removeDirRecursive(const QString& dirName)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     QDir(dirName).removeRecursively();
 #else
     QDir dir(dirName);
@@ -439,7 +439,7 @@ QString Utils::Fs::QDesktopServicesCacheLocation()
 
 QString Utils::Fs::QDesktopServicesDownloadLocation()
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #if defined(Q_OS_WIN)
     if (QSysInfo::windowsVersion() <= QSysInfo::WV_XP)  // Windows XP
         return QDir(QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation)).absoluteFilePath(
diff --git a/src/gui/ico.cpp b/src/gui/ico.cpp
index a2184e626..1d4c43b33 100644
--- a/src/gui/ico.cpp
+++ b/src/gui/ico.cpp
@@ -424,7 +424,7 @@ bool ICOHandler::canRead(QIODevice *device)
 
 class ICOPlugin : public QImageIOPlugin
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     Q_PLUGIN_METADATA(IID "org.qbittorrent.ICOPlugin")
 #endif
 public:
@@ -461,7 +461,7 @@ QImageIOHandler *ICOPlugin::create(QIODevice *device, const QByteArray &format)
     return handler;
 }
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
 Q_EXPORT_STATIC_PLUGIN(ICOPlugin)
 Q_EXPORT_PLUGIN2(ico, ICOPlugin)
 #endif
diff --git a/src/gui/lineedit/src/lineedit.cpp b/src/gui/lineedit/src/lineedit.cpp
index 78dc6870c..0335944bf 100644
--- a/src/gui/lineedit/src/lineedit.cpp
+++ b/src/gui/lineedit/src/lineedit.cpp
@@ -27,7 +27,7 @@ LineEdit::LineEdit(QWidget *parent)
 
     int clearButtonSizeHintWidth = 0;
     int clearButtonSizeHintHeight = 0;
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     QPixmap pixmap2(":/lineeditimages/clear_left.png");
     clearButton = new QToolButton(this);
     clearButton->setIcon(QIcon(pixmap2));
@@ -58,13 +58,13 @@ void LineEdit::resizeEvent(QResizeEvent *e)
 
     QSize sz = searchButton->sizeHint();
     searchButton->move(frameWidth, (e->size().height() - sz.height()) / 2);
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     QSize cz = clearButton->sizeHint();
     clearButton->move((e->size().width() - frameWidth - cz.width()), (e->size().height() - sz.height()) / 2);
 #endif
 }
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
 void LineEdit::updateCloseButton(const QString &text)
 {
     clearButton->setVisible(!text.isEmpty());
diff --git a/src/gui/lineedit/src/lineedit.h b/src/gui/lineedit/src/lineedit.h
index 84e0d5cf4..6b39d9088 100644
--- a/src/gui/lineedit/src/lineedit.h
+++ b/src/gui/lineedit/src/lineedit.h
@@ -24,14 +24,14 @@ public:
 protected:
     void resizeEvent(QResizeEvent *e);
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
 private slots:
     void updateCloseButton(const QString &text);
 #endif
 
 private:
     QToolButton *searchButton;
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     QToolButton *clearButton;
 #endif
 };
diff --git a/src/gui/options_imp.cpp b/src/gui/options_imp.cpp
index a3d2dc705..c1b6b1e03 100644
--- a/src/gui/options_imp.cpp
+++ b/src/gui/options_imp.cpp
@@ -90,7 +90,7 @@ options_imp::options_imp(QWidget *parent)
         }
     }
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
     scanFoldersView->horizontalHeader()->setResizeMode(QHeaderView::ResizeToContents);
 #else
     scanFoldersView->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
diff --git a/src/gui/previewlistdelegate.h b/src/gui/previewlistdelegate.h
index 10849be2d..0330c045a 100644
--- a/src/gui/previewlistdelegate.h
+++ b/src/gui/previewlistdelegate.h
@@ -42,7 +42,7 @@
 #include "previewselect.h"
 
 #ifdef Q_OS_WIN
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
 #include <QPlastiqueStyle>
 #else
 #include <QProxyStyle>
@@ -80,7 +80,7 @@ class PreviewListDelegate: public QItemDelegate {
           QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
 #else
           // XXX: To avoid having the progress text on the right of the bar
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
           QPlastiqueStyle st;
 #else
           QProxyStyle st("fusion");
diff --git a/src/gui/previewselect.cpp b/src/gui/previewselect.cpp
index 11f937ab4..f37fe3654 100644
--- a/src/gui/previewselect.cpp
+++ b/src/gui/previewselect.cpp
@@ -32,7 +32,7 @@
 #include <QHeaderView>
 #include <QMessageBox>
 #include <QFile>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QTableView>
 #endif
 
@@ -54,7 +54,7 @@ PreviewSelect::PreviewSelect(QWidget* parent, BitTorrent::TorrentHandle *const t
   previewListModel->setHeaderData(NAME, Qt::Horizontal, tr("Name"));
   previewListModel->setHeaderData(SIZE, Qt::Horizontal, tr("Size"));
   previewListModel->setHeaderData(PROGRESS, Qt::Horizontal, tr("Progress"));
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
     QTableView unused;
diff --git a/src/gui/properties/peersadditiondlg.cpp b/src/gui/properties/peersadditiondlg.cpp
index 172c8d671..77444935a 100644
--- a/src/gui/properties/peersadditiondlg.cpp
+++ b/src/gui/properties/peersadditiondlg.cpp
@@ -39,7 +39,7 @@ PeersAdditionDlg::PeersAdditionDlg(QWidget *parent)
     setupUi(this);
     connect(buttonBox, SIGNAL(accepted()), this, SLOT(validateInput()));
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     label_format->hide();
     peers_txt->setPlaceholderText("Format: IPv4:port / [IPv6]:port");
 #endif
diff --git a/src/gui/properties/propertieswidget.cpp b/src/gui/properties/propertieswidget.cpp
index e03c1cc79..b3f2cefb5 100644
--- a/src/gui/properties/propertieswidget.cpp
+++ b/src/gui/properties/propertieswidget.cpp
@@ -100,7 +100,7 @@ PropertiesWidget::PropertiesWidget(QWidget *parent, MainWindow* main_window, Tra
   connect(filesList->header(), SIGNAL(sectionResized(int, int, int)), this, SLOT(saveSettings()));
   connect(filesList->header(), SIGNAL(sortIndicatorChanged(int, Qt::SortOrder)), this, SLOT(saveSettings()));
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+#ifdef QBT_USES_QT5
   // set bar height relative to screen dpi
   int barHeight = devicePixelRatio() * 18;
 #else
diff --git a/src/gui/properties/proplistdelegate.cpp b/src/gui/properties/proplistdelegate.cpp
index dbd18ecda..5afd028a7 100644
--- a/src/gui/properties/proplistdelegate.cpp
+++ b/src/gui/properties/proplistdelegate.cpp
@@ -38,7 +38,7 @@
 #include <QApplication>
 
 #ifdef Q_OS_WIN
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
 #include <QPlastiqueStyle>
 #else
 #include <QProxyStyle>
@@ -82,7 +82,7 @@ void PropListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &opti
             QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
 #else
             // XXX: To avoid having the progress text on the right of the bar
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
             QPlastiqueStyle st;
 #else
             QProxyStyle st("fusion");
diff --git a/src/gui/properties/trackerlist.cpp b/src/gui/properties/trackerlist.cpp
index 2c0548637..fb9bf8d91 100644
--- a/src/gui/properties/trackerlist.cpp
+++ b/src/gui/properties/trackerlist.cpp
@@ -37,7 +37,7 @@
 #include <QDebug>
 #include <QUrl>
 #include <QMessageBox>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QTableView>
 #include <QHeaderView>
 #endif
@@ -85,7 +85,7 @@ TrackerList::TrackerList(PropertiesWidget *properties): QTreeWidget(), propertie
   deleteHotkey = new QShortcut(QKeySequence(QKeySequence::Delete), this, SLOT(deleteSelectedTrackers()), 0, Qt::WidgetShortcut);
   copyHotkey = new QShortcut(QKeySequence(Qt::ControlModifier + Qt::Key_C), this, SLOT(copyTrackerUrl()), 0, Qt::WidgetShortcut);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
     QTableView unused;
diff --git a/src/gui/torrentcontenttreeview.cpp b/src/gui/torrentcontenttreeview.cpp
index 1427866f2..9c0ce06a8 100644
--- a/src/gui/torrentcontenttreeview.cpp
+++ b/src/gui/torrentcontenttreeview.cpp
@@ -32,7 +32,7 @@
 
 #include <QKeyEvent>
 #include <QModelIndexList>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QTableView>
 #include <QHeaderView>
 #endif
@@ -42,7 +42,7 @@
 TorrentContentTreeView::TorrentContentTreeView(QWidget* parent)
   : QTreeView(parent)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
     QTableView unused;
diff --git a/src/gui/transferlistdelegate.cpp b/src/gui/transferlistdelegate.cpp
index 06ec193f2..099cc3170 100644
--- a/src/gui/transferlistdelegate.cpp
+++ b/src/gui/transferlistdelegate.cpp
@@ -42,7 +42,7 @@
 #include "core/unicodestrings.h"
 
 #ifdef Q_OS_WIN
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
 #include <QPlastiqueStyle>
 #else
 #include <QProxyStyle>
@@ -214,7 +214,7 @@ void TransferListDelegate::paint(QPainter * painter, const QStyleOptionViewItem
       QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
 #else
       // XXX: To avoid having the progress text on the right of the bar
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
         QPlastiqueStyle st;
 #else
         QProxyStyle st("fusion");
diff --git a/src/gui/transferlistwidget.cpp b/src/gui/transferlistwidget.cpp
index 909ba7cd8..1a6524467 100644
--- a/src/gui/transferlistwidget.cpp
+++ b/src/gui/transferlistwidget.cpp
@@ -40,7 +40,7 @@
 #include <QRegExp>
 #include <QFileDialog>
 #include <QMessageBox>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QTableView>
 #endif
 
@@ -156,7 +156,7 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *main_window)
     editHotkey = new QShortcut(QKeySequence("F2"), this, SLOT(renameSelectedTorrent()), 0, Qt::WidgetShortcut);
     deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(deleteSelectedTorrents()), 0, Qt::WidgetShortcut);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
     QTableView unused;
diff --git a/src/searchengine/engineselectdlg.cpp b/src/searchengine/engineselectdlg.cpp
index 1afbadf6e..4e16e81e8 100644
--- a/src/searchengine/engineselectdlg.cpp
+++ b/src/searchengine/engineselectdlg.cpp
@@ -47,7 +47,7 @@
 #include <QTemporaryFile>
 #include <QMimeData>
 #include <QClipboard>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QTableView>
 #endif
 
@@ -60,7 +60,7 @@ engineSelectDlg::engineSelectDlg(QWidget *parent, SupportedEngines *supported_en
 {
   setupUi(this);
   setAttribute(Qt::WA_DeleteOnClose);
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
   // This hack fixes reordering of first column with Qt5.
   // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
   QTableView unused;
diff --git a/src/searchengine/searchtab.cpp b/src/searchengine/searchtab.cpp
index 8eeea89da..3d1ce051c 100644
--- a/src/searchengine/searchtab.cpp
+++ b/src/searchengine/searchtab.cpp
@@ -33,7 +33,7 @@
 #include <QStandardItemModel>
 #include <QHeaderView>
 #include <QSortFilterProxyModel>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
 #include <QTableView>
 #endif
 
@@ -48,7 +48,7 @@ SearchTab::SearchTab(SearchEngine *parent) : QWidget(), parent(parent)
     box = new QVBoxLayout();
     results_lbl = new QLabel();
     resultsBrowser = new QTreeView();
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+#ifdef QBT_USES_QT5
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
     QTableView unused;
diff --git a/src/src.pro b/src/src.pro
index 059dce5df..95d19914c 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -5,6 +5,7 @@ CONFIG += qt thread silent
 # C++11 support
 CONFIG += c++11
 DEFINES += BOOST_NO_CXX11_RVALUE_REFERENCES
+greaterThan(QT_MAJOR_VERSION, 4): DEFINES += QBT_USES_QT5
 
 # Windows specific configuration
 win32: include(../winconf.pri)
diff --git a/src/webui/abstractwebapplication.cpp b/src/webui/abstractwebapplication.cpp
index 34323573a..2824780a5 100644
--- a/src/webui/abstractwebapplication.cpp
+++ b/src/webui/abstractwebapplication.cpp
@@ -260,7 +260,7 @@ void AbstractWebApplication::translateDocument(QString& data)
             if (isTranslationNeeded) {
                 size_t context_index = 0;
                 while ((context_index < context_count) && (translation == word)) {
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#ifndef QBT_USES_QT5
                     translation = qApp->translate(contexts[context_index].c_str(), word.constData(), 0, QCoreApplication::UnicodeUTF8, 1);
 #else
                     translation = qApp->translate(contexts[context_index].c_str(), word.constData(), 0, 1);
diff --git a/src/webui/btjson.cpp b/src/webui/btjson.cpp
index cf20fb223..342683709 100644
--- a/src/webui/btjson.cpp
+++ b/src/webui/btjson.cpp
@@ -41,7 +41,7 @@
 
 #include <QDebug>
 #include <QVariant>
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
+#ifndef QBT_USES_QT5
 #include <QMetaType>
 #endif
 #if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
@@ -188,7 +188,7 @@ public:
     QTorrentCompare(QString key, bool greaterThan = false)
         : key_(key)
         , greaterThan_(greaterThan)
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
+#ifndef QBT_USES_QT5
         , type_(QVariant::Invalid)
 #endif
     {
@@ -196,7 +196,7 @@ public:
 
     bool operator()(QVariant torrent1, QVariant torrent2)
     {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
+#ifndef QBT_USES_QT5
         if (type_ == QVariant::Invalid)
             type_ = torrent1.toMap().value(key_).type();
 
@@ -229,7 +229,7 @@ public:
 private:
     QString key_;
     bool greaterThan_;
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
+#ifndef QBT_USES_QT5
     QVariant::Type type_;
 #endif
 };
@@ -793,7 +793,7 @@ QVariantMap generateSyncData(int acceptedResponseId, QVariantMap data, QVariantM
         lastAcceptedData.clear();
         syncData = data;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0) && QT_VERSION < QT_VERSION_CHECK(5, 5, 0))
+#if (QBT_USES_QT5 && QT_VERSION < QT_VERSION_CHECK(5, 5, 0))
         // QJsonDocument::fromVariant() supports QVariantHash only
         // since Qt5.5, so manually convert data["torrents"]
         QVariantMap torrentsMap;
diff --git a/src/webui/jsonutils.h b/src/webui/jsonutils.h
index 55288278e..a8375c3b7 100644
--- a/src/webui/jsonutils.h
+++ b/src/webui/jsonutils.h
@@ -30,7 +30,7 @@
 #define JSONUTILS_H
 
 #include <QVariant>
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+#ifdef QBT_USES_QT5
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QJsonArray>
@@ -49,7 +49,7 @@ namespace json {
 
     inline QByteArray toJson(const QVariant& var)
     {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+#ifdef QBT_USES_QT5
         return QJsonDocument::fromVariant(var).toJson(QJsonDocument::Compact);
 #else
         QJson::Serializer serializer;
@@ -60,7 +60,7 @@ namespace json {
 
     inline QVariant fromJson(const QString& json)
     {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+#ifdef QBT_USES_QT5
         return QJsonDocument::fromJson(json.toUtf8()).toVariant();
 #else
         return QJson::Parser().parse(json.toUtf8());