Add subtree add command to make sure DCPlugin is included

OnDemandUpdatePTU.pro

@@ -0,0 +1,73 @@
+# QT -= gui
+QT += core
+QT += widgets serialport
+QT += network
+
+TARGET = up_dev_ctrl
+
+CONFIG += c++11
+# CONFIG -= app_bundle
+
+# DEFINES+=LinuxDesktop
+
+QMAKE_CXXFLAGS += -Wno-deprecated-copy
+
+# custom target for 'git subtree'
+# subtree.target = subtree
+# subtree.commands = git subtree add --prefix DCPlugin https://git.mimbach49.de/GerhardHoffmann/DCPlugin.git master --squash
+# subtree.depends =
+# QMAKE_EXTRA_UNIX_TARGETS += subtree
+
+! exists(DCPlugin) {
+    $$system("git subtree add --prefix DCPlugin https://git.mimbach49.de/GerhardHoffmann/DCPlugin.git master --squash")
+} else {
+    # $$system("git subtree pull --prefix DCPlugin https://git.mimbach49.de/GerhardHoffmann/DCPlugin.git master --squash")
+}
+
+# You can make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+contains( CONFIG, PTU5 ) {
+    greaterThan(QT_MAJOR_VERSION, 4): QT += serialport
+    CONFIG += link_pkgconfig
+    lessThan(QT_MAJOR_VERSION, 5):   PKGCONFIG += qextserialport
+    QMAKE_CXXFLAGS += -std=c++11   # for GCC >= 4.7
+    QMAKE_CXXFLAGS += -Wno-deprecated-copy
+    ARCH = PTU5
+    DEFINES+=PTU5
+}
+contains( CONFIG, DesktopLinux ) {
+    greaterThan(QT_MAJOR_VERSION, 4): QT += serialport
+    lessThan(QT_MAJOR_VERSION, 5):    CONFIG += extserialport
+    # QMAKE_CC = ccache $$QMAKE_CC
+    # QMAKE_CXX = ccache $$QMAKE_CXX
+    QMAKE_CXXFLAGS += -std=c++11
+    QMAKE_CXXFLAGS += -Wno-deprecated-copy
+    linux-clang {  QMAKE_CXXFLAGS += -Qunused-arguments   }
+    ARCH = DesktopLinux
+    DEFINES+=DesktopLinux
+}
+
+SOURCES += \
+        main.cpp \
+        update.cpp \
+        message_handler.cpp
+
+HEADERS += \
+        update.h \
+        message_handler.h \
+        DCPlugin/include/interfaces.h
+
+OTHER_FILES += \
+    /opt/app/tools/atbupdate/update_log.csv
+
+# https://blog.developer.atlassian.com/the-power-of-git-subtree/?_ga=2-71978451-1385799339-1568044055-1068396449-1567112770
+# git subtree add --prefix DCPlugin https://git.mimbach49.de/GerhardHoffmann/DCPlugin.git master --squash
+# git subtree pull --prefix DCPlugin https://git.mimbach49.de/GerhardHoffmann/DCPlugin.git master --squash
+include(./DCPlugin/DCPlugin.pri)
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target