diff --git a/Utilities/qtsingleapplication/qthandlenewappinstance.cpp b/Utilities/qtsingleapplication/qthandlenewappinstance.cpp
index 0b462405dd..0e554b0a62 100644
--- a/Utilities/qtsingleapplication/qthandlenewappinstance.cpp
+++ b/Utilities/qtsingleapplication/qthandlenewappinstance.cpp
@@ -1,116 +1,118 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include "qthandlenewappinstance.h"
 
 #include "qtsingleapplication.h"
 #include <QDir>
 #include <stdlib.h> // mkdtemp
+#ifdef Q_OS_UNIX
 #include <unistd.h>
+#endif
 #ifdef Q_OS_WIN
 #include <windows.h>
 //#include <private/qfsfileengine_p.h>
 #endif
 
 bool createTemporaryDir(QString& path)
 {
   QString baseName = QCoreApplication::applicationName();
   if (baseName.isEmpty())
   {
     baseName = QLatin1String("mitk_temp");
   }
 
   QString templateName = QDir::tempPath() + QLatin1Char('/') + baseName + QLatin1String("-XXXXXX");
   bool success = false;
 
 #ifdef Q_OS_WIN
   QString buffer = templateName;
   // Windows' mktemp believes 26 temp files per process ought to be enough for everyone (!)
   // Let's add a few random chars then, before the XXXXXX template.
   for (int i = 0 ; i < 4 ; ++i)
     buffer += QChar((qrand() & 0xffff) % (26) + 'A');
   if (!buffer.endsWith(QLatin1String("XXXXXX")))
     buffer += QLatin1String("XXXXXX");
   //QFileSystemEntry baseEntry(buffer);
   //QFileSystemEntry::NativePath basePath = baseEntry.nativeFilePath();
   QString basePath = QDir::toNativeSeparators(buffer);
   wchar_t* array = (wchar_t*)basePath.utf16();
   if (_wmktemp(array) && ::CreateDirectoryW(array, 0))
   {
     success = true;
     //QFileSystemEntry entry(QString::fromWCharArray(array), QFileSystemEntry::FromNativePath());
     //path = entry.filePath();
     path = QDir::fromNativeSeparators(QString::fromUtf16((const ushort*)array));
   }
 #else
   QByteArray buffer = QFile::encodeName(templateName);
   if (!buffer.endsWith("XXXXXX"))
     buffer += "XXXXXX";
   if (mkdtemp(buffer.data())) { // modifies buffer
     success = true;
     path = QFile::decodeName(buffer.constData());
   }
 #endif
 
   return success;
 }
 
 QString handleNewAppInstance(QtSingleApplication* singleApp, int argc, char** argv, const QString& newInstanceArg)
 {
   if (singleApp->isRunning())
   {
     QStringList args;
     bool newInstance = false;
     for (int i = 0; i < argc; ++i)
     {
       args << argv[i];
       if (args.back().endsWith(newInstanceArg))
       {
         newInstance = true;
       }
     }
 
     if (newInstance)
     {
       QString path;
       if (!createTemporaryDir(path))
       {
         qCritical("Could not create temporary storage path for new application instance.");
         exit(EXIT_FAILURE);
       }
       qWarning("Forcing new application instance. The application data will be written to a temporary directory.");
       return path;
     }
     else
     {
       QByteArray ba;
       QDataStream msg(&ba, QIODevice::WriteOnly);
       msg << QString("$cmdLineArgs"); // This message contains command line arguments
       msg << args;
       if(singleApp->sendMessage(ba))
       {
         exit(EXIT_SUCCESS);
       }
       else
       {
         qCritical("The running application seems to be frozen.");
         exit(EXIT_FAILURE);
       }
     }
   }
   return QString();
 }