diff --git a/OnDemandUpdatePTU.pro b/OnDemandUpdatePTU.pro
index 4ae0329..dd5ff21 100644
--- a/OnDemandUpdatePTU.pro
+++ b/OnDemandUpdatePTU.pro
@@ -176,7 +176,10 @@ GIT_COMMIT=$$system("git log -1 --format=oneline | cut -d' ' -f1")
 
 EXTENDED_VERSION="$${VERSION}-$${GIT_COMMIT}"
 
-INCLUDEPATH += plugins
+!contains(CONFIG, INCLUDEINTERFACES) {
+    INCLUDEINTERFACES=/opt/ptu5/opt/DCLibraries/include
+}
+INCLUDEPATH += plugins $${INCLUDEINTERFACES}
 
 CONFIG += c++17
 # CONFIG -= app_bundle
@@ -249,9 +252,7 @@ HEADERS += \
         process/command.h \
         message_handler.h \
         worker.h \
-        interfaces.h \
-        commandline_parser.h \
-        plugins/interfaces.h
+        commandline_parser.h
 
 OTHER_FILES += \
     ATBUpdateTool.ini