diff --git a/mainwindow.cpp b/mainwindow.cpp
index c5679d2..3dedc84 100755
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -9,6 +9,7 @@
  * introduced in CatGui in 2021, dec. 6.
 */
 
+#include "version.h"
 
 
 char MainWindow::loadPlugIn(char lade1_entlade2)
@@ -22,9 +23,14 @@ char MainWindow::loadPlugIn(char lade1_entlade2)
 
 // select system:
 
+#if defined (ARCH_WINDOWS)
     // Windows DT
-//    pluginLoader->setFileName("../../SlavePlug/CAslave.dll"); // for windows
+    pluginLoader->setFileName("../../SlavePlug/CAslave.dll"); // for windows
+#elif defined (ARCH_DesktopLinux)
+    pluginLoader->setFileName("../../SlavePlug/libCAslave.so");
+#elif defined (ARCH_PTU5)
     pluginLoader->setFileName("/usr/lib/libCAslave.so"); // for PTU5
+#endif
 
     if (lade1_entlade2==2)
     {