diff --git a/src/QmlStyleUrlInterceptor.h b/src/QmlStyleUrlInterceptor.h
index e5ba5e8..84e06ad 100644
--- a/src/QmlStyleUrlInterceptor.h
+++ b/src/QmlStyleUrlInterceptor.h
@@ -32,6 +32,8 @@
 //============================================================================
 #include <QQmlAbstractUrlInterceptor>
 
+#include "acss_globals.h"
+
 namespace acss
 {
 class QtAdvancedStylesheet;
@@ -64,7 +66,7 @@ class QtAdvancedStylesheet;
  * and turn them into absolute paths (with the help of the @c QtAdvancedStylesheet
  * instance passed in the constructor) that can be understood by QML.
  */
-class CQmlStyleUrlInterceptor : public QQmlAbstractUrlInterceptor
+class ACSS_EXPORT CQmlStyleUrlInterceptor : public QQmlAbstractUrlInterceptor
 {
 public:
     /**
diff --git a/src/QtAdvancedStylesheet.h b/src/QtAdvancedStylesheet.h
index 9e2559a..5602fd5 100644
--- a/src/QtAdvancedStylesheet.h
+++ b/src/QtAdvancedStylesheet.h
@@ -34,7 +34,10 @@
 #include <QPair>
 #include <QObject>
 
-class QIcon;
+#include "acss_globals.h"
+
+
+QT_FORWARD_DECLARE_CLASS(QIcon)
 
 namespace acss
 {
@@ -45,7 +48,7 @@ using tColorReplaceList = QVector<QStringPair>;
 /**
  * Encapsulates all information about a single stylesheet based style
  */
-class QtAdvancedStylesheet : public QObject
+class ACSS_EXPORT QtAdvancedStylesheet : public QObject
 {
 	Q_OBJECT
 private:
diff --git a/src/acss_globals.h b/src/acss_globals.h
new file mode 100644
index 0000000..2d5b258
--- /dev/null
+++ b/src/acss_globals.h
@@ -0,0 +1,60 @@
+#ifndef acss_globalsH
+#define acss_globalsH
+/*******************************************************************************
+** Qt Advanced Stylesheets
+** Copyright (C) 2022 Uwe Kindler
+**
+** This library is free software; you can redistribute it and/or
+** modify it under the terms of the GNU Lesser General Public
+** License as published by the Free Software Foundation; either
+** version 2.1 of the License, or (at your option) any later version.
+**
+** This library is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+** Lesser General Public License for more details.
+**
+** You should have received a copy of the GNU Lesser General Public
+** License along with this library; If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+
+//============================================================================
+/// \file   ACSS_globals.h
+/// \author Uwe Kindler
+/// \date   19.04.2022
+//============================================================================
+
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <QtCore/QtGlobal>
+#include <QDebug>
+
+
+#ifndef ACSS_STATIC
+#ifdef ACSS_SHARED_EXPORT
+#define ACSS_EXPORT Q_DECL_EXPORT
+#else
+#define ACSS_EXPORT Q_DECL_IMPORT
+#endif
+#else
+#define ACSS_EXPORT
+#endif
+
+// Define ACSS_DEBUG_PRINT to enable a lot of debug output
+#ifdef ACSS_DEBUG_PRINT
+#define ACSS_PRINT(s) qDebug() << s
+#else
+#define ACSS_PRINT(s)
+#endif
+
+// Set ACSS_DEBUG_LEVEL to enable additional debug output and to enable layout
+// dumps to qDebug and std::cout after layout changes
+#define ACSS_DEBUG_LEVEL 0
+
+
+
+//---------------------------------------------------------------------------
+#endif // acss_globalsH
diff --git a/src/src.pro b/src/src.pro
index 972b614..4c2efc4 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -30,6 +30,7 @@ windows {
 #RESOURCES += ads.qrc
 
 HEADERS += \
+    acss_globals.h \
 	QmlStyleUrlInterceptor.h \
 	QtAdvancedStylesheet.h