Fix export of FileViewer

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2406 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/gui/src/file_viewer.hh

@@ -23,10 +23,12 @@
 #include <QSyntaxHighlighter>
 #include <QTextEdit>
 
+#include <ost/gui/module_config.hh>
+
 namespace ost { namespace gui {
 
 /// \brief a simplistic file viewer
-class FileViewer : public QWidget {
+class DLLEXPORT_OST_GUI FileViewer : public QWidget {
   Q_OBJECT
 public:
   FileViewer(const QString& path=QString(), QWidget* parent=NULL);