diff --git a/.gitignore b/.gitignore
index 59696c5a1..ec2225d08 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,6 +27,7 @@
 *.moc
 moc_*.cpp
 ui_*.h
+resources.cpp
 
 # Python files
 *.pyc
diff --git a/resources/resources-theme.qrc b/resources/resources-theme.qrc
new file mode 100644
index 000000000..f8e7e1136
--- /dev/null
+++ b/resources/resources-theme.qrc
@@ -0,0 +1,6 @@
+<RCC version="1.0">
+    <qresource prefix="/">
+        <file>bitmaps/style/arrow.png</file>
+        <file>bitmaps/style/groupbox.png</file>
+    </qresource>
+</RCC>
diff --git a/source/backend/CarlaStandalone.hpp b/source/backend/CarlaStandalone.hpp
index 824078f74..ec3a13c3a 100644
--- a/source/backend/CarlaStandalone.hpp
+++ b/source/backend/CarlaStandalone.hpp
@@ -183,8 +183,6 @@ struct CarlaTransportInfo {
 CARLA_EXPORT const char* carla_get_extended_license_text();
 CARLA_EXPORT const char* carla_get_supported_file_types();
 
-CARLA_EXPORT void carla_set_up_qt(uintptr_t app);
-
 CARLA_EXPORT unsigned int carla_get_engine_driver_count();
 CARLA_EXPORT const char* carla_get_engine_driver_name(unsigned int index);
 
diff --git a/source/backend/standalone/CarlaStandalone.cpp b/source/backend/standalone/CarlaStandalone.cpp
index 398722c3e..9735664b6 100644
--- a/source/backend/standalone/CarlaStandalone.cpp
+++ b/source/backend/standalone/CarlaStandalone.cpp
@@ -60,7 +60,11 @@ struct CarlaBackendStandalone {
           callbackPtr(nullptr),
           engine(nullptr),
           app(qApp),
-          needsInit(app == nullptr) {}
+          needsInit(app == nullptr)
+    {
+        if (app != nullptr)
+            app->setStyle(new CarlaStyle());
+    }
 
     void init()
     {
@@ -87,18 +91,6 @@ struct CarlaBackendStandalone {
         app = nullptr;
     }
 
-    void registerThemeIfPossible(QApplication* const hostApp)
-    {
-        if (needsInit)
-            return;
-
-        CARLA_ASSERT(app != nullptr);
-        CARLA_ASSERT(app == hostApp);
-
-        if (app == hostApp)
-            hostApp->setStyle(new CarlaStyle());
-    }
-
     CARLA_DECLARE_NON_COPY_STRUCT_WITH_LEAK_DETECTOR(CarlaBackendStandalone)
 
 } standalone;
@@ -198,21 +190,6 @@ const char* carla_get_supported_file_types()
 
 // -------------------------------------------------------------------------------------------------------------------
 
-void carla_set_up_qt(uintptr_t app)
-{
-    carla_debug("carla_set_up_qt(" P_UINTPTR ")", app);
-
-    CARLA_ASSERT(app != 0);
-
-    if (app == 0)
-        return;
-
-    QApplication* hostApp = (QApplication*)CarlaBackend::getPointerFromAddress(app);
-    standalone.registerThemeIfPossible(hostApp);
-}
-
-// -------------------------------------------------------------------------------------------------------------------
-
 unsigned int carla_get_engine_driver_count()
 {
     carla_debug("carla_get_engine_driver_count()");
diff --git a/source/carla.py b/source/carla.py
index f9b382f5c..c10c17806 100755
--- a/source/carla.py
+++ b/source/carla.py
@@ -1951,7 +1951,6 @@ if __name__ == '__main__':
     Carla.host = Host(libName)
     Carla.host.set_engine_callback(engineCallback)
     Carla.host.set_engine_option(OPTION_PROCESS_NAME, 0, "carla")
-    Carla.host.set_up_qt(app)
 
     # Set bridge paths
     if carla_bridge_native:
diff --git a/source/carla_backend.py b/source/carla_backend.py
index 71cecde39..e642aced7 100644
--- a/source/carla_backend.py
+++ b/source/carla_backend.py
@@ -21,7 +21,6 @@
 
 from ctypes import *
 from platform import architecture
-from sip import unwrapinstance
 from sys import platform, maxsize
 
 # ------------------------------------------------------------------------------------------------------------
@@ -254,7 +253,6 @@ else:
 
 c_enum = c_int
 c_nullptr = None
-c_uintptr = c_uint64 if kIs64bit else c_uint32
 
 CallbackFunc = CFUNCTYPE(None, c_void_p, c_enum, c_uint, c_int, c_int, c_float, c_char_p)
 
@@ -373,9 +371,6 @@ class Host(object):
         self.lib.carla_get_supported_file_types.argtypes = None
         self.lib.carla_get_supported_file_types.restype = c_char_p
 
-        self.lib.carla_set_up_qt.argtypes = [c_uintptr]
-        self.lib.carla_set_up_qt.restype = None
-
         self.lib.carla_get_engine_driver_count.argtypes = None
         self.lib.carla_get_engine_driver_count.restype = c_uint
 
@@ -612,9 +607,6 @@ class Host(object):
     def get_supported_file_types(self):
         return self.lib.carla_get_supported_file_types()
 
-    def set_up_qt(self, app):
-        self.lib.carla_set_up_qt(unwrapinstance(app))
-
     def get_engine_driver_count(self):
         return self.lib.carla_get_engine_driver_count()
 
diff --git a/source/libs/Makefile b/source/libs/Makefile
index 562b47103..390d9c9eb 100644
--- a/source/libs/Makefile
+++ b/source/libs/Makefile
@@ -60,3 +60,4 @@ clean:
 	$(MAKE) clean -C lilv
 	$(MAKE) clean -C rtmempool
 	$(MAKE) clean -C ../widgets
+	$(MAKE) clean -C ../theme
diff --git a/source/theme/CarlaStyle.cpp b/source/theme/CarlaStyle.cpp
index 6ae0b3cac..18df33293 100644
--- a/source/theme/CarlaStyle.cpp
+++ b/source/theme/CarlaStyle.cpp
@@ -22,17 +22,36 @@
 #include <QtGui/QPainter>
 #include <QtGui/QPixmapCache>
 
-#include <QtGui/QApplication>
-#include <QtGui/QComboBox>
-#include <QtGui/QGroupBox>
-#include <QtGui/QMainWindow>
-#include <QtGui/QProgressBar>
-#include <QtGui/QPushButton>
-#include <QtGui/QScrollBar>
-#include <QtGui/QSlider>
-#include <QtGui/QSpinBox>
-#include <QtGui/QSplitter>
-#include <QtGui/QWizard>
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+# include <QtWidgets/qdrawutil.h>
+# include <QtWidgets/QApplication>
+# include <QtWidgets/QComboBox>
+# include <QtWidgets/QGroupBox>
+# include <QtWidgets/QMainWindow>
+# include <QtWidgets/QProgressBar>
+# include <QtWidgets/QPushButton>
+# include <QtWidgets/QScrollBar>
+# include <QtWidgets/QSlider>
+# include <QtWidgets/QSpinBox>
+# include <QtWidgets/QSplitter>
+# include <QtWidgets/QWizard>
+#else
+# include <QtGui/QApplication>
+# include <QtGui/QComboBox>
+# include <QtGui/QGroupBox>
+# include <QtGui/QMainWindow>
+# include <QtGui/QProgressBar>
+# include <QtGui/QPushButton>
+# include <QtGui/QScrollBar>
+# include <QtGui/QSlider>
+# include <QtGui/QSpinBox>
+# include <QtGui/QSplitter>
+# include <QtGui/QWizard>
+#endif
+
+#ifdef CARLA_EXPORT_STYLE
+# include <QtGui/QStylePlugin>
+#endif
 
 #define BEGIN_STYLE_PIXMAPCACHE(a) \
     QRect rect = option->rect; \
@@ -3457,21 +3476,28 @@ QRect CarlaStyle::subElementRect(SubElement sr, const QStyleOption *opt, const Q
     return r;
 }
 
-CarlaStylePlugin::CarlaStylePlugin(QObject* parent)
-    : QStylePlugin(parent)
-{
-}
+#ifdef CARLA_EXPORT_STYLE
+# include "resources.cpp"
 
-QStyle* CarlaStylePlugin::create(const QString& key)
+class CarlaStylePlugin : public QStylePlugin
 {
-    return (key.toLower() == "carla") ? new CarlaStyle : nullptr;
-}
+    Q_OBJECT
 
-QStringList CarlaStylePlugin::keys() const
-{
-    return QStringList() << "carla";
-}
+public:
+    CarlaStylePlugin(QObject* parent = nullptr)
+        : QStylePlugin(parent) {}
 
-Q_EXPORT_PLUGIN2(carla, CarlaStylePlugin)
+    QStyle* create(const QString& key)
+    {
+        return (key.toLower() == "Carla") ? new CarlaStyle() : nullptr;
+    }
+
+    QStringList keys() const
+    {
+        return QStringList() << "Carla";
+    }
+};
 
-#include "resources.cpp"
+Q_EXPORT_PLUGIN2(Carla, CarlaStylePlugin)
+
+#endif
diff --git a/source/theme/CarlaStyle.hpp b/source/theme/CarlaStyle.hpp
index efb76271d..02a581ff6 100644
--- a/source/theme/CarlaStyle.hpp
+++ b/source/theme/CarlaStyle.hpp
@@ -19,8 +19,13 @@
 #ifndef __CARLA_STYLE_HPP__
 #define __CARLA_STYLE_HPP__
 
-#include <QtGui/QCommonStyle>
-#include <QtGui/QStylePlugin>
+#include <QtCore/Qt>
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+# include <QtWidgets/QCommonStyle>
+#else
+# include <QtGui/QCommonStyle>
+#endif
 
 class CarlaStylePrivate;
 
@@ -59,14 +64,4 @@ private:
     friend class CarlaStylePrivate;
 };
 
-class CarlaStylePlugin : public QStylePlugin
-{
-    Q_OBJECT
-
-public:
-    CarlaStylePlugin(QObject* parent = nullptr);
-    QStyle* create(const QString& key);
-    QStringList keys() const;
-};
-
 #endif // __CARLA_STYLE_HPP__
diff --git a/source/theme/CarlaStyleAnimations.hpp b/source/theme/CarlaStyleAnimations.hpp
index e6967a57e..1ec04130e 100644
--- a/source/theme/CarlaStyleAnimations.hpp
+++ b/source/theme/CarlaStyleAnimations.hpp
@@ -23,7 +23,12 @@
 #include <QtCore/QCoreApplication>
 #include <QtCore/QDateTime>
 #include <QtGui/QImage>
-#include <QtGui/QWidget>
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+# include <QtWidgets/QWidget>
+#else
+# include <QtGui/QWidget>
+#endif
 
 class CarlaStyleAnimation : public QAbstractAnimation
 {
diff --git a/source/utils/CarlaUtils.hpp b/source/utils/CarlaUtils.hpp
index 284b5cb9b..b83aae61e 100644
--- a/source/utils/CarlaUtils.hpp
+++ b/source/utils/CarlaUtils.hpp
@@ -62,6 +62,8 @@ void carla_debug(const char* const fmt, ...)
     std::vfprintf(stdout, fmt, args);
 #ifndef CARLA_OS_WIN
     std::fprintf(stdout, "\x1b[0m\n");
+#else
+    std::fprintf(stdout, "\n");
 #endif
     va_end(args);
 }
@@ -98,6 +100,8 @@ void carla_stderr2(const char* const fmt, ...)
     std::vfprintf(stderr, fmt, args);
 #ifndef CARLA_OS_WIN
     std::fprintf(stderr, "\x1b[0m\n");
+#else
+    std::fprintf(stderr, "\n");
 #endif
     va_end(args);
 }