diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e45ba83..bf01ee76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,9 +23,11 @@ enable_testing()
 
 # disable experimental Qt Quick GUI by default except on mobile platforms, enable libsyncthing by default
 if (ANDROID OR IOS)
+    set(WIDGET_GUI_ENABLED_BY_DEFAULT OFF)
     set(QUICK_GUI_ENABLED_BY_DEFAULT ON)
     set(LIBSYNCTHING_DISABLED_BY_DEFAULT OFF)
 else ()
+    set(WIDGET_GUI_ENABLED_BY_DEFAULT ON)
     set(QUICK_GUI_ENABLED_BY_DEFAULT OFF)
     set(LIBSYNCTHING_DISABLED_BY_DEFAULT ON)
 endif ()
@@ -63,6 +65,7 @@ option(NO_FILE_ITEM_ACTION_PLUGIN "whether building the file item action plugin
 option(NO_MODEL "whether building models should be skipped, implies NO_TRAY" OFF)
 option(NO_WIDGETS "whether building widgets should be skipped, implies NO_TRAY" OFF)
 option(NO_PLASMOID "whether building the Plasmoid for the Plasma desktop should be skipped" "${PLASMOID_DISABLED_BY_DEFAULT}")
+option(WIDGETS_GUI "enables/disables building the Qt Widgets GUI (disabled by default)" ${WIDGET_GUI_ENABLED_BY_DEFAULT})
 option(QUICK_GUI "enables/disables building the experimental Qt Quick GUI (disabled by default)" ${QUICK_GUI_ENABLED_BY_DEFAULT})
 
 # allow using non-default configuration
diff --git a/syncthingmodel/CMakeLists.txt b/syncthingmodel/CMakeLists.txt
index 0d635484..e26fc766 100644
--- a/syncthingmodel/CMakeLists.txt
+++ b/syncthingmodel/CMakeLists.txt
@@ -8,13 +8,13 @@ set(META_APP_DESCRIPTION "Data models of Syncthing Tray")
 set(META_PROJECT_VARNAME_UPPER LIB_SYNCTHING_MODEL)
 set(META_PUBLIC_QT_MODULES Gui Widgets)
 set(META_SRCDIR_REFS "${CMAKE_CURRENT_SOURCE_DIR}/../syncthingconnector")
+set(META_GUI_OPTIONAL ON)
 
 # add project files
 set(HEADER_FILES
     syncthingmodel.h
     syncthingdirectorymodel.h
     syncthingdevicemodel.h
-    syncthingdownloadmodel.h
     syncthingerrormodel.h
     syncthingfilemodel.h
     syncthingrecentchangesmodel.h
@@ -27,7 +27,6 @@ set(SRC_FILES
     syncthingmodel.cpp
     syncthingdirectorymodel.cpp
     syncthingdevicemodel.cpp
-    syncthingdownloadmodel.cpp
     syncthingerrormodel.cpp
     syncthingfilemodel.cpp
     syncthingrecentchangesmodel.cpp
@@ -35,6 +34,8 @@ set(SRC_FILES
     syncthingstatuscomputionmodel.cpp
     syncthingstatusselectionmodel.cpp
     syncthingicons.cpp)
+set(WIDGETS_HEADER_FILES syncthingdownloadmodel.h)
+set(WIDGETS_SRC_FILES syncthingdownloadmodel.cpp)
 set(RES_FILES resources/${META_PROJECT_NAME}icons.qrc)
 
 set(TS_FILES translations/${META_PROJECT_NAME}_zh_CN.ts translations/${META_PROJECT_NAME}_cs_CZ.ts
@@ -61,14 +62,7 @@ find_package(${PACKAGE_NAMESPACE_PREFIX}qtforkawesome${CONFIGURATION_PACKAGE_SUF
 use_qt_fork_awesome(VISIBILITY PUBLIC)
 
 # link also explicitly against the following Qt modules
-list(
-    APPEND
-    ADDITIONAL_QT_MODULES
-    Concurrent
-    Network
-    Gui
-    Widgets
-    Svg)
+list(APPEND ADDITIONAL_QT_MODULES Concurrent Network Gui Svg)
 
 # include modules to apply configuration
 include(BasicConfig)
diff --git a/syncthingwidgets/CMakeLists.txt b/syncthingwidgets/CMakeLists.txt
index 6d9eb08e..521cbea4 100644
--- a/syncthingwidgets/CMakeLists.txt
+++ b/syncthingwidgets/CMakeLists.txt
@@ -3,11 +3,14 @@ cmake_minimum_required(VERSION 3.17.0 FATAL_ERROR)
 # metadata
 set(META_PROJECT_NAME syncthingwidgets)
 set(META_PROJECT_TYPE library)
-set(META_APP_NAME "Widgets of Syncthing Tray")
+set(META_APP_NAME "UI elements of Syncthing Tray")
 set(META_PUBLIC_QT_MODULES Gui Widgets)
 set(META_WEBVIEW_SRC_DIR webview)
+set(META_GUI_OPTIONAL ON)
 
 # add project files
+set(HEADER_FILES misc/diffhighlighter.h misc/internalerror.h misc/statusinfo.h misc/syncthinglauncher.h misc/utils.h)
+set(SRC_FILES misc/diffhighlighter.cpp misc/internalerror.cpp misc/statusinfo.cpp misc/syncthinglauncher.cpp misc/utils.cpp)
 set(WIDGETS_HEADER_FILES
     settings/settings.h
     settings/settingsdialog.h
@@ -18,13 +21,9 @@ set(WIDGETS_HEADER_FILES
     misc/textviewdialog.h
     misc/internalerrorsdialog.h
     misc/direrrorsdialog.h
-    misc/statusinfo.h
     misc/dbusstatusnotifier.h
-    misc/internalerror.h
     misc/otherdialogs.h
-    misc/syncthinglauncher.h
-    misc/syncthingkiller.h
-    misc/utils.h)
+    misc/syncthingkiller.h)
 set(WIDGETS_SRC_FILES
     settings/settings.cpp
     settings/settingsdialog.cpp
@@ -38,13 +37,9 @@ set(WIDGETS_SRC_FILES
     misc/textviewdialog.cpp
     misc/internalerrorsdialog.cpp
     misc/direrrorsdialog.cpp
-    misc/statusinfo.cpp
     misc/dbusstatusnotifier.cpp
-    misc/internalerror.cpp
     misc/otherdialogs.cpp
-    misc/syncthinglauncher.cpp
-    misc/syncthingkiller.cpp
-    misc/utils.cpp)
+    misc/syncthingkiller.cpp)
 set(RES_FILES resources/${META_PROJECT_NAME}icons.qrc)
 set(WIDGETS_UI_FILES
     settings/connectionoptionpage.ui
diff --git a/syncthingwidgets/misc/diffhighlighter.cpp b/syncthingwidgets/misc/diffhighlighter.cpp
new file mode 100644
index 00000000..d72bc955
--- /dev/null
+++ b/syncthingwidgets/misc/diffhighlighter.cpp
@@ -0,0 +1,37 @@
+#include "./diffhighlighter.h"
+
+#include <syncthingmodel/colors.h>
+
+#include <QFont>
+#include <QFontDatabase>
+#include <QTextDocument>
+
+using namespace std;
+using namespace Data;
+
+namespace QtGui {
+
+DiffHighlighter::DiffHighlighter(QTextDocument *parent)
+    : QSyntaxHighlighter(parent)
+    , m_enabled(true)
+{
+    auto font = QFontDatabase::systemFont(QFontDatabase::FixedFont);
+    m_baseFormat.setFont(font);
+
+    font.setBold(true);
+    m_addedFormat.setFont(font);
+    m_addedFormat.setForeground(Colors::green(true));
+    m_deletedFormat.setFont(font);
+    m_deletedFormat.setForeground(Colors::red(true));
+}
+
+void DiffHighlighter::highlightBlock(const QString &text)
+{
+    if (text.startsWith(QChar('-'))) {
+        setFormat(0, static_cast<int>(text.size()), QColor(Qt::red));
+    } else if (text.startsWith(QChar('+'))) {
+        setFormat(0, static_cast<int>(text.size()), QColor(Qt::green));
+    }
+}
+
+} // namespace QtGui
diff --git a/syncthingwidgets/misc/diffhighlighter.h b/syncthingwidgets/misc/diffhighlighter.h
new file mode 100644
index 00000000..785108da
--- /dev/null
+++ b/syncthingwidgets/misc/diffhighlighter.h
@@ -0,0 +1,39 @@
+#ifndef SYNCTHINGWIDGETS_DIFF_HIGHLIGHTER_H
+#define SYNCTHINGWIDGETS_DIFF_HIGHLIGHTER_H
+
+#include "../global.h"
+
+#include <QSyntaxHighlighter>
+#include <QTextCharFormat>
+
+namespace QtGui {
+
+class SYNCTHINGWIDGETS_EXPORT DiffHighlighter : public QSyntaxHighlighter {
+    Q_OBJECT
+    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled)
+public:
+    explicit DiffHighlighter(QTextDocument *parent = nullptr);
+
+    bool isEnabled() const
+    {
+        return m_enabled;
+    }
+    void setEnabled(bool enabled)
+    {
+        if (enabled != m_enabled) {
+            m_enabled = enabled;
+            rehighlight();
+        }
+    }
+
+protected:
+    void highlightBlock(const QString &text) override;
+
+private:
+    QTextCharFormat m_baseFormat, m_addedFormat, m_deletedFormat;
+    bool m_enabled;
+};
+
+} // namespace QtGui
+
+#endif // SYNCTHINGWIDGETS_DIFF_HIGHLIGHTER_H
diff --git a/syncthingwidgets/misc/internalerror.cpp b/syncthingwidgets/misc/internalerror.cpp
index 61e88af0..144fe542 100644
--- a/syncthingwidgets/misc/internalerror.cpp
+++ b/syncthingwidgets/misc/internalerror.cpp
@@ -1,7 +1,9 @@
 #include "./internalerror.h"
 #include "./syncthinglauncher.h"
 
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
 #include "../settings/settings.h"
+#endif
 
 #include <syncthingconnector/syncthingconnection.h>
 #include <syncthingconnector/syncthingservice.h>
@@ -12,6 +14,7 @@ using namespace Data;
 
 namespace QtGui {
 
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
 /*!
  * \brief Returns whether to ignore inavailability after start or standby-wakeup.
  */
@@ -61,6 +64,7 @@ static bool ignoreInavailabilityAfterStart(const Settings::Settings &settings, c
 #endif
     return false;
 }
+#endif
 
 /*!
  * \brief Returns whether the error is relevant. Only in this case a notification for the error should be shown.
@@ -78,6 +82,7 @@ bool InternalError::isRelevant(const SyncthingConnection &connection, SyncthingE
         return true;
     }
 
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
     // ignore configuration errors on first launch (to avoid greeting people with an error message)
     const auto &settings = Settings::values();
     if ((settings.firstLaunch || settings.fakeFirstLaunch)
@@ -105,5 +110,8 @@ bool InternalError::isRelevant(const SyncthingConnection &connection, SyncthingE
         service,
 #endif
         message, networkError);
+#else
+    return true;
+#endif
 }
 } // namespace QtGui
diff --git a/syncthingwidgets/misc/otherdialogs.cpp b/syncthingwidgets/misc/otherdialogs.cpp
index e2d173e8..117a60c6 100644
--- a/syncthingwidgets/misc/otherdialogs.cpp
+++ b/syncthingwidgets/misc/otherdialogs.cpp
@@ -1,4 +1,6 @@
 #include "./otherdialogs.h"
+
+#include "./diffhighlighter.h"
 #include "./textviewdialog.h"
 
 #include <syncthingconnector/syncthingconnection.h>
@@ -36,29 +38,6 @@ using namespace Data;
 
 namespace QtGui {
 
-DiffHighlighter::DiffHighlighter(QTextDocument *parent)
-    : QSyntaxHighlighter(parent)
-    , m_enabled(true)
-{
-    auto font = QFontDatabase::systemFont(QFontDatabase::FixedFont);
-    m_baseFormat.setFont(font);
-
-    font.setBold(true);
-    m_addedFormat.setFont(font);
-    m_addedFormat.setForeground(Colors::green(true));
-    m_deletedFormat.setFont(font);
-    m_deletedFormat.setForeground(Colors::red(true));
-}
-
-void DiffHighlighter::highlightBlock(const QString &text)
-{
-    if (text.startsWith(QChar('-'))) {
-        setFormat(0, static_cast<int>(text.size()), QColor(Qt::red));
-    } else if (text.startsWith(QChar('+'))) {
-        setFormat(0, static_cast<int>(text.size()), QColor(Qt::green));
-    }
-}
-
 static void setupOwnDeviceIdDialog(Data::SyncthingConnection &connection, int size, QWidget *dlg)
 {
     dlg->setWindowTitle(QCoreApplication::translate("QtGui::OtherDialogs", "Own device ID") + QStringLiteral(" - " APP_NAME));
diff --git a/syncthingwidgets/misc/otherdialogs.h b/syncthingwidgets/misc/otherdialogs.h
index 7ea228d0..154d1c08 100644
--- a/syncthingwidgets/misc/otherdialogs.h
+++ b/syncthingwidgets/misc/otherdialogs.h
@@ -5,9 +5,6 @@
 
 #include <QtGlobal>
 
-#include <QSyntaxHighlighter>
-#include <QTextCharFormat>
-
 QT_FORWARD_DECLARE_CLASS(QDialog)
 QT_FORWARD_DECLARE_CLASS(QWidget)
 
@@ -19,32 +16,6 @@ struct SyncthingDir;
 namespace QtGui {
 class TextViewDialog;
 
-class SYNCTHINGWIDGETS_EXPORT DiffHighlighter : public QSyntaxHighlighter {
-    Q_OBJECT
-    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled)
-public:
-    explicit DiffHighlighter(QTextDocument *parent = nullptr);
-
-    bool isEnabled() const
-    {
-        return m_enabled;
-    }
-    void setEnabled(bool enabled)
-    {
-        if (enabled != m_enabled) {
-            m_enabled = enabled;
-            rehighlight();
-        }
-    }
-
-protected:
-    void highlightBlock(const QString &text) override;
-
-private:
-    QTextCharFormat m_baseFormat, m_addedFormat, m_deletedFormat;
-    bool m_enabled;
-};
-
 SYNCTHINGWIDGETS_EXPORT QDialog *ownDeviceIdDialog(Data::SyncthingConnection &connection);
 SYNCTHINGWIDGETS_EXPORT QWidget *ownDeviceIdWidget(Data::SyncthingConnection &connection, int size, QWidget *parent = nullptr);
 SYNCTHINGWIDGETS_EXPORT QDialog *browseRemoteFilesDialog(
diff --git a/syncthingwidgets/misc/syncthinglauncher.cpp b/syncthingwidgets/misc/syncthinglauncher.cpp
index 50956ac6..a33a542f 100644
--- a/syncthingwidgets/misc/syncthinglauncher.cpp
+++ b/syncthingwidgets/misc/syncthinglauncher.cpp
@@ -3,7 +3,9 @@
 #include <syncthingconnector/syncthingconnection.h>
 #include <syncthingconnector/utils.h>
 
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
 #include "../settings/settings.h"
+#endif
 
 #include <c++utilities/io/ansiescapecodes.h>
 
@@ -41,7 +43,9 @@ SyncthingLauncher *SyncthingLauncher::s_mainInstance = nullptr;
  */
 SyncthingLauncher::SyncthingLauncher(QObject *parent)
     : QObject(parent)
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
     , m_lastLauncherSettings(nullptr)
+#endif
     , m_relevantConnection(nullptr)
     , m_guiListeningUrlSearch("Access the GUI via the following URL: ", "\n\r", std::string_view(), BufferSearch::CallbackType())
     , m_exitSearch("Syncthing exited: ", "\n\r", std::string_view(), BufferSearch::CallbackType())
@@ -92,7 +96,9 @@ void SyncthingLauncher::setRunning(bool running, LibSyncthing::RuntimeOptions &&
         tearDownLibSyncthing();
     }
     // save runtime options so Syncthing can resume in case runtime conditions allow it
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
     m_lastLauncherSettings = nullptr;
+#endif
     m_lastRuntimeOptions = std::move(runtimeOptions);
     // emit signal in any case (even if there's no change) so runningStatus() is re-evaluated
     emit runningChanged(shouldBeRunning);
@@ -155,13 +161,19 @@ void SyncthingLauncher::setNetworkConnectionMetered(std::optional<bool> metered)
             if (metered.value_or(false)) {
                 terminateDueToMeteredConnection();
             } else if (!metered.value_or(true) && m_stoppedMetered) {
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
                 if (m_lastLauncherSettings) {
                     launch(*m_lastLauncherSettings);
-#ifdef SYNCTHINGWIDGETS_USE_LIBSYNCTHING
-                } else if (m_lastRuntimeOptions) {
-                    launch(*m_lastRuntimeOptions);
+                }
 #endif
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS) && defined(SYNCTHINGWIDGETS_USE_LIBSYNCTHING)
+                else
+#endif
+#if defined(SYNCTHINGWIDGETS_USE_LIBSYNCTHING)
+                if (m_lastRuntimeOptions) {
+                    launch(*m_lastRuntimeOptions);
                 }
+#endif
             }
         }
         emit networkConnectionMeteredChanged(metered);
@@ -231,6 +243,7 @@ void SyncthingLauncher::launch(const QString &program, const QStringList &argume
 #endif
 }
 
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
 /*!
  * \brief Launches a Syncthing instance according to the specified \a launcherSettings.
  * \remarks Does nothing if already running an instance.
@@ -267,6 +280,7 @@ void SyncthingLauncher::launch(const Settings::Launcher &launcherSettings)
     m_lastRuntimeOptions.reset();
 #endif
 }
+#endif
 
 #ifdef SYNCTHINGWIDGETS_USE_LIBSYNCTHING
 /*!
@@ -438,9 +452,11 @@ void SyncthingLauncher::terminateDueToMeteredConnection()
         // running before)
         return;
     }
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
     if (m_lastLauncherSettings && !m_relevantConnection) {
         m_relevantConnection = m_lastLauncherSettings->connectionForLauncher(this);
     }
+#endif
     terminate(m_relevantConnection);
     m_stoppedMetered = true;
 }
diff --git a/syncthingwidgets/misc/syncthinglauncher.h b/syncthingwidgets/misc/syncthinglauncher.h
index d590e13e..2d51d936 100644
--- a/syncthingwidgets/misc/syncthinglauncher.h
+++ b/syncthingwidgets/misc/syncthinglauncher.h
@@ -98,7 +98,9 @@ class SYNCTHINGWIDGETS_EXPORT SyncthingLauncher : public QObject {
 
 public Q_SLOTS:
     void launch(const QString &program, const QStringList &arguments);
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
     void launch(const Settings::Launcher &launcherSettings);
+#endif
     void terminate(Data::SyncthingConnection *relevantConnection = nullptr);
     void kill();
     void tearDownLibSyncthing();
@@ -124,7 +126,9 @@ private Q_SLOTS:
 
     SyncthingProcess m_process;
     QUrl m_guiListeningUrl;
+#if defined(SYNCTHINGWIDGETS_GUI_QTWIDGETS)
     const Settings::Launcher *m_lastLauncherSettings;
+#endif
 #ifdef SYNCTHINGWIDGETS_USE_LIBSYNCTHING
     std::optional<LibSyncthing::RuntimeOptions> m_lastRuntimeOptions;
 #endif
diff --git a/tray/CMakeLists.txt b/tray/CMakeLists.txt
index 8b6f65b1..f7bfbf35 100644
--- a/tray/CMakeLists.txt
+++ b/tray/CMakeLists.txt
@@ -4,8 +4,7 @@ cmake_minimum_required(VERSION 3.17.0 FATAL_ERROR)
 set(META_PROJECT_TYPE application)
 set(META_APP_NAME "Syncthing Tray")
 set(META_APP_NAME_QUICK_GUI "Syncthing App")
-set(META_HAS_QUICK_GUI ON)
-set(META_QUICK_GUI_OPTIONAL ON)
+set(META_GUI_OPTIONAL ON)
 set(META_USE_QQC2 ON)
 if (QUICK_GUI)
     set(META_QT_VERSION 6.8.0)
@@ -15,6 +14,8 @@ endif ()
 set(META_SRCDIR_REFS "${CMAKE_CURRENT_SOURCE_DIR}\n${CMAKE_CURRENT_SOURCE_DIR}/../syncthingconnector")
 
 # add project files
+set(HEADER_FILES)
+set(SRC_FILES application/main.cpp)
 set(WIDGETS_HEADER_FILES
     application/singleinstance.h
     gui/trayicon.h
@@ -28,7 +29,6 @@ set(WIDGETS_HEADER_FILES
     gui/downloadview.h
     gui/helper.h)
 set(WIDGETS_SRC_FILES
-    application/main.cpp
     application/singleinstance.cpp
     gui/trayicon.cpp
     gui/traywidget.cpp
diff --git a/tray/application/main.cpp b/tray/application/main.cpp
index 6b8feac5..5d6d174f 100644
--- a/tray/application/main.cpp
+++ b/tray/application/main.cpp
@@ -2,17 +2,21 @@
 #define QT_UTILITIES_GUI_QTQUICK
 #endif
 
+#ifdef GUI_QTWIDGETS
 #include "./singleinstance.h"
 
 #include "../gui/trayicon.h"
 #include "../gui/traywidget.h"
+#endif
 
 #ifdef GUI_QTQUICK
 #include "../gui/quick/app.h"
 #endif
 
 #include <syncthingwidgets/misc/syncthinglauncher.h>
+#ifdef GUI_QTWIDGETS
 #include <syncthingwidgets/settings/settings.h>
+#endif
 
 #include <syncthingmodel/syncthingicons.h>
 
@@ -39,13 +43,13 @@
 #include <qtutilities/resources/resources.h>
 #include <qtutilities/settingsdialog/qtsettings.h>
 
-#include <QMessageBox>
 #include <QNetworkAccessManager>
 #include <QSettings>
 #include <QStringBuilder>
 
 #ifdef GUI_QTWIDGETS
 #include <QApplication>
+#include <QMessageBox>
 using QtApp = QApplication;
 #else
 #include <QGuiApplication>
@@ -83,6 +87,8 @@ Q_IMPORT_PLUGIN(ForkAwesomeIconEnginePlugin)
 
 ENABLE_QT_RESOURCES_OF_STATIC_DEPENDENCIES
 
+#ifdef GUI_QTWIDGETS
+
 #ifdef LIB_SYNCTHING_CONNECTOR_SUPPORT_SYSTEMD
 static void handleSystemdServiceError(const QString &context, const QString &name, const QString &message)
 {
@@ -184,11 +190,16 @@ static void shutdownSyncthingTray()
     Settings::Launcher::terminate();
 }
 
+#endif
+
 static int runApplication(int argc, const char *const *argv)
 {
     // setup argument parser
     auto parser = ArgumentParser();
     auto qtConfigArgs = QT_CONFIG_ARGUMENTS();
+    auto insecureArg = ConfigValueArgument("insecure", '\0', "allow any self-signed certificate");
+    insecureArg.setFlags(Argument::Flags::Deprecated, true); // hide as it is only for development
+#ifdef GUI_QTWIDGETS
     auto windowedArg = ConfigValueArgument("windowed", 'w', "opens the tray menu as a regular window");
     auto showWebUiArg = ConfigValueArgument("webui", '\0', "instantly shows the web UI - meant for creating shortcut to web UI");
     auto triggerArg = ConfigValueArgument("trigger", '\0', "instantly shows the left-click tray menu - meant for creating a shortcut");
@@ -197,8 +208,6 @@ static int runApplication(int argc, const char *const *argv)
     assumeFirstLaunchArg.setFlags(Argument::Flags::Deprecated, true); // hide as it is debug-only
     auto wipArg = ConfigValueArgument("wip", '\0', "enables WIP features");
     wipArg.setFlags(Argument::Flags::Deprecated, true); // hide as it is debug-only
-    auto insecureArg = ConfigValueArgument("insecure", '\0', "allow any self-signed certificate");
-    insecureArg.setFlags(Argument::Flags::Deprecated, true); // hide as it is only for development
     auto waitForTrayArg = ConfigValueArgument("wait", '\0',
         "wait until the system tray becomes available instead of showing an error message if the system tray is not available on start-up");
     auto connectionArg = ConfigValueArgument("connection", '\0', "specifies one or more connection configurations to be used", { "config name" });
@@ -213,6 +222,7 @@ static int runApplication(int argc, const char *const *argv)
     auto &widgetsGuiArg = qtConfigArgs.qtWidgetsGuiArg();
     widgetsGuiArg.addSubArguments({ &windowedArg, &showWebUiArg, &triggerArg, &waitForTrayArg, &connectionArg, &configPathArg, &singleInstanceArg,
         &newInstanceArg, &replaceArg, &showWizardArg, &assumeFirstLaunchArg, &wipArg, &insecureArg });
+#endif
 #ifdef GUI_QTQUICK
     auto &quickGuiArg = qtConfigArgs.qtQuickGuiArg();
     quickGuiArg.addSubArgument(&insecureArg);
@@ -240,14 +250,21 @@ static int runApplication(int argc, const char *const *argv)
     syncthingArg.setSubArguments({ &syncthingHelp });
 #endif
 
-    parser.setMainArguments({ &widgetsGuiArg,
+    parser.setMainArguments({
+#ifdef GUI_QTWIDGETS
+        &widgetsGuiArg,
+#endif
 #ifdef GUI_QTQUICK
         &quickGuiArg,
 #endif
 #ifdef SYNCTHINGTRAY_USE_LIBSYNCTHING
         &cliArg, &syncthingArg,
 #endif
-        &parser.noColorArg(), &parser.helpArg(), &quitArg });
+        &parser.noColorArg(), &parser.helpArg(),
+#ifdef GUI_QTWIDGETS
+        &quitArg
+#endif
+    });
 
     // parse arguments
 #if defined(Q_OS_ANDROID)
@@ -259,6 +276,7 @@ static int runApplication(int argc, const char *const *argv)
 #endif
     parser.parseArgs(argc, argv);
 
+#ifdef GUI_QTWIDGETS
     // quit already running application if quit is present
     static auto firstRun = true;
     if (quitArg.isPresent() && !firstRun) {
@@ -266,6 +284,7 @@ static int runApplication(int argc, const char *const *argv)
         QCoreApplication::quit();
         return EXIT_SUCCESS;
     }
+#endif
 
 #ifdef GUI_QTQUICK
     if (quickGuiArg.isPresent()) {
@@ -293,6 +312,7 @@ static int runApplication(int argc, const char *const *argv)
     }
 #endif
 
+#ifdef GUI_QTWIDGETS
     // quit unless Qt Widgets GUI should be shown
     if (!widgetsGuiArg.isPresent()) {
         return EXIT_SUCCESS;
@@ -389,6 +409,9 @@ static int runApplication(int argc, const char *const *argv)
         trigger(triggerArg.isPresent(), showWebUiArg.isPresent(), showWizardArg.isPresent());
     }
     return res;
+#else
+    return EXIT_SUCCESS;
+#endif
 }
 
 int main(int argc, char *argv[])
diff --git a/tray/gui/quick/app.cpp b/tray/gui/quick/app.cpp
index fdf8a23f..a69ef683 100644
--- a/tray/gui/quick/app.cpp
+++ b/tray/gui/quick/app.cpp
@@ -8,7 +8,6 @@
 
 #include <syncthingwidgets/misc/internalerror.h>
 #include <syncthingwidgets/misc/otherdialogs.h>
-#include <syncthingwidgets/settings/settings.h>
 
 #include <syncthingmodel/syncthingerrormodel.h>
 #include <syncthingmodel/syncthingfilemodel.h>
diff --git a/tray/gui/quick/app.h b/tray/gui/quick/app.h
index a575a035..d202ad22 100644
--- a/tray/gui/quick/app.h
+++ b/tray/gui/quick/app.h
@@ -3,6 +3,7 @@
 
 #include "./quickicon.h"
 
+#include <syncthingwidgets/misc/diffhighlighter.h>
 #include <syncthingwidgets/misc/internalerror.h>
 #include <syncthingwidgets/misc/otherdialogs.h>
 #include <syncthingwidgets/misc/statusinfo.h>