diff --git a/lib_ca_master/lib_ca_master.pro b/lib_ca_master/lib_ca_master.pro
index 50c433d..f694294 100644
--- a/lib_ca_master/lib_ca_master.pro
+++ b/lib_ca_master/lib_ca_master.pro
@@ -6,5 +6,8 @@ include(../DCLibraries.pri)
 
 DEFINES+=THIS_IS_CA_MASTER
 DESTDIR=$${_PRO_FILE_PWD_}/../build
-system("mkdir -p $${DESTDIR}")
-system("cp ../include/interfaces.h $${DESTDIR}")
+
+unix {
+    system("mkdir -p $${DESTDIR}")
+    system("cp ../include/interfaces.h $${DESTDIR}")
+}