diff --git a/Fervor.pri b/Fervor.pri
index f4c3973..1985715 100644
--- a/Fervor.pri
+++ b/Fervor.pri
@@ -1,21 +1,34 @@
+QT += core network
+!build_pass:message("If you want to enable GUI for Fervor, add CONFIG += fervor_gui to your .pro file")
 contains(QT_VERSION, ^5\\.[0-9]\\..*){
-    QT += core widgets webkitwidgets network
+    fervor_gui {
+        DEFINES += FV_GUI
+        QT += webkitwidgets
+    }
     win32:INCLUDEPATH += $$[QT_INSTALL_PREFIX]/include/QtZlib
 }else{
-    #QT += core gui webkit network
-    QT += core webkit network
     fervor_gui {
         DEFINES += FV_GUI
-        QT += gui
+        QT += gui webkit
     }
     win32:INCLUDEPATH += $$[QT_INSTALL_PREFIX]/../../../../QtSources/4.8.1/src/3rdparty/zlib
 }
 DEFINES += FV_APP_NAME=\\\"$$TARGET\\\"
 DEFINES += FV_APP_VERSION=\\\"$$VERSION\\\"
 
+PREVIOUS_FERVOR_GUI = $$cat($$PWD/fervor.gui)
+fervor_gui {
+    CURRENT_FERVOR_GUI = enabled
+} else {
+    CURRENT_FERVOR_GUI = disabled
+}
+# if last build was with another GUI option, recompile some files
+!equals(PREVIOUS_FERVOR_GUI, $$CURRENT_FERVOR_GUI) {
+    write_file($$PWD/fervor.gui, CURRENT_FERVOR_GUI)
+    touch($$PWD/fvupdater.h, $$PWD/fervor.gui)
+}
 
-
-DEFINES +=QUAZIP_BUILD QUAZIP_STATIC
+DEFINES += QUAZIP_BUILD QUAZIP_STATIC
 
 INCLUDEPATH += $$PWD/quazip
 HEADERS += $$PWD/quazip/crypt.h \
diff --git a/fvignoredversions.cpp b/fvignoredversions.cpp
index c665f9c..3c47ef5 100644
--- a/fvignoredversions.cpp
+++ b/fvignoredversions.cpp
@@ -4,12 +4,14 @@
 #include <QCoreApplication>
 #include <string>
 
+extern QSettings* settings;
+
 // QSettings key for the latest skipped version
 #define FV_IGNORED_VERSIONS_LATEST_SKIPPED_VERSION_KEY	"FVLatestSkippedVersion"
 
 
 FVIgnoredVersions::FVIgnoredVersions(QObject *parent) :
-QObject(parent)
+	QObject(parent)
 {
 	// noop
 }
@@ -21,32 +23,27 @@ bool FVIgnoredVersions::VersionIsIgnored(QString version)
 	//	2) The version that was skipped before and thus stored in QSettings (ignore)
 	//	3) A newer version (don't ignore)
 	// 'version' is not likely to contain an older version in any case.
-    
+
 	if (version == QCoreApplication::applicationVersion()) {
 		return true;
 	}
-    
-    QSettings settings(QSettings::NativeFormat,
-					   QSettings::UserScope,
-					   QCoreApplication::organizationDomain(),
-					   QCoreApplication::applicationName());
-    
+
 	//QSettings settings;
-	if (settings.contains(FV_IGNORED_VERSIONS_LATEST_SKIPPED_VERSION_KEY)) {
-		QString lastSkippedVersion = settings.value(FV_IGNORED_VERSIONS_LATEST_SKIPPED_VERSION_KEY).toString();
+	if (settings->contains(FV_IGNORED_VERSIONS_LATEST_SKIPPED_VERSION_KEY)) {
+		QString lastSkippedVersion = settings->value(FV_IGNORED_VERSIONS_LATEST_SKIPPED_VERSION_KEY).toString();
 		if (version == lastSkippedVersion) {
 			// Implicitly skipped version - skip
 			return true;
 		}
 	}
-    
+
 	std::string currentAppVersion = QCoreApplication::applicationVersion().toStdString();
 	std::string suggestedVersion = std::string(version.toStdString());
 	if (FvVersionComparator::CompareVersions(currentAppVersion, suggestedVersion) == FvVersionComparator::kAscending) {
 		// Newer version - do not skip
 		return false;
 	}
-    
+
 	// Fallback - skip
 	return true;
 }
@@ -57,18 +54,13 @@ void FVIgnoredVersions::IgnoreVersion(QString version)
 		// Don't ignore the current version
 		return;
 	}
-    
+
 	if (version.isEmpty()) {
 		return;
 	}
-    
-    QSettings settings(QSettings::NativeFormat,
-					   QSettings::UserScope,
-					   QCoreApplication::organizationDomain(),
-					   QCoreApplication::applicationName());
-    
 
-	settings.setValue(FV_IGNORED_VERSIONS_LATEST_SKIPPED_VERSION_KEY, version);
-    
+	//QSettings settings;
+	settings->setValue(FV_IGNORED_VERSIONS_LATEST_SKIPPED_VERSION_KEY, version);
+
 	return;
-}
\ No newline at end of file
+}
diff --git a/fvupdater.cpp b/fvupdater.cpp
index 3fb99b3..45f8855 100644
--- a/fvupdater.cpp
+++ b/fvupdater.cpp
@@ -786,12 +786,12 @@ void FvUpdater::finishUpdate(QString pathToFinish)
 void FvUpdater::restartApplication()
 {
 	// Spawn a new instance of myApplication:
-    QString app = QApplication::applicationFilePath();
-    QStringList arguments = QApplication::arguments();
+    QString app = QCoreApplication::applicationFilePath();
+    QStringList arguments = QCoreApplication::arguments();
     QString wd = QDir::currentPath();
     qDebug() << app << arguments << wd;
     QProcess::startDetached(app, arguments, wd);
-    QApplication::exit();
+    QCoreApplication::exit();
 }
 
 void FvUpdater::setRequiredSslFingerPrint(QString md5)
@@ -903,4 +903,4 @@ void FvUpdater::decideWhatToDoWithCurrentUpdateProposal()
 		RemindMeLater();
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/fvupdatewindow.h b/fvupdatewindow.h
index b2e3feb..f9b2fcb 100644
--- a/fvupdatewindow.h
+++ b/fvupdatewindow.h
@@ -1,11 +1,7 @@
 #ifndef FVUPDATEWINDOW_H
 #define FVUPDATEWINDOW_H
 
-#if QT_VERSION >= 0x050000
-    #include <QtWidgets/QWidget>
-#else
-    #include <QWidget>
-#endif
+#include <QWidget>
 
 class QGraphicsScene;