Fixed compilation on Linux

src/slic3r/GUI/MsgDialog.cpp

@@ -17,7 +17,7 @@
 #include "I18N.hpp"
 #include "ConfigWizard.hpp"
 #include "wxExtensions.hpp"
-#include "Mainframe.hpp"
+#include "slic3r/GUI/MainFrame.hpp"
 #include "GUI_App.hpp"
 
 namespace Slic3r {

src/slic3r/GUI/MsgDialog.hpp

@@ -7,6 +7,7 @@
 #include <wx/dialog.h>
 #include <wx/font.h>
 #include <wx/bitmap.h>
+#include <wx/msgdlg.h>
 
 class wxBoxSizer;
 class wxCheckBox;