neptune3 cannot be build for b2qt since qtivi is missing dependencies to build the generator

make[2]: Entering directory '/home/gleugner/devel/pi_b2qt/neptune/src/remotesettings'
cd frontend/ && ( test -e Makefile || /home/gleugner/qt/commercial/5.11.3/Boot2Qt/raspberrypi3/toolchain/sysroots/x86_64-pokysdk-linux/usr/bin/qmake -o Makefile /home/gleugner/devel/neptune3-ui/src/remotesettings/frontend/frontend.pro ) && make -f Makefile 
Project ERROR: No ivigenerator available

➜ pi_b2qt rm qtivi -rf
➜ pi_b2qt mkdir qtivi 
➜ pi_b2qt cd qtivi 
➜ qtivi source ~/qt/commercial/5.11.3/Boot2Qt/raspberrypi3/toolchain/environment-setup-cortexa7hf-neon-vfpv4-poky-linux-gnueabi 
➜ qtivi qmake ../../qtivi 
Info: creating stash file /home/gleugner/devel/pi_b2qt/qtivi/.qmake.stash
Info: creating cache file /home/gleugner/devel/pi_b2qt/qtivi/.qmake.cache
Running configuration tests...
Checking for DLT... no
Checking for DLT >= 2.12... no
Checking for Python3... yes
Checking for virtualenv... no
Checking for qface 1.10... no
Checking for taglib... no
Checking for taglib_submodule... yes
Done running configuration tests.
Configure summary:
Qt GENIVI Extras ......................... no
Qt IVI Core:
Python3:
Executable ........................... /home/gleugner/qt/commercial/5.11.3/Boot2Qt/raspberrypi3/toolchain/sysroots/x86_64-pokysdk-linux/usr/bin/python3
Version .............................. 3.5.2
virtualenv ........................... no
System QFace ......................... no
IVI Generator .......................... no
QtSimulator Support .................... no
QtRemoteObjects Support ................ yes
Qt IVI VehicleFunctions .................. no
Qt IVI Media:
taglib ................................. yes
Using system taglib .................. no
Backends:
Mediaplayer Simulation Backend ....... yes
Tuner Simulation Backend ............. yes
MPRIS Backend ........................ yes
Note: No DLT libs found. Disabled building Qt GENIVI Extras.
WARNING: Cannot build the IVI Generator because its dependencies are not satisfied.
The IVI Generator provides tooling to generate source code out of IDL files.
Make sure python3 and its 'virtualenv' packages are installed.
E.g. by running
apt-get install python3 python3-virtualenv
And make sure the qface submodule is initialized or the correct qface version is installed on your system.
E.g. by running the following command:
git submodule init && git submodule update
WARNING: Cannot enable the QtSimulator Support because the QtSimulator module is not installed.
The QtSimulator Support is needed for the communication between the simulation backends and its control panel(controller).
WARNING: Cannot build the IVI VehicleFunctions module because its dependencies are not satisfied or it was disabled.
The IVI VehicleFunctions module needs the IVI Core module and the IVI Generator.
Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/home/gleugner/qt/commercial/5.11.3/Boot2Qt/raspberrypi3/toolchain/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/usr'.
Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

cd /home/gleugner/qt/commercial/5.11.3/Boot2Qt/raspberrypi3/toolchain/sysroots/x86_64-pokysdk-linux/usr/bin
rm python3
ln -s /usr/bin/python3 python3

➜  pi_b2qt /home/gleugner/qt/commercial/5.11.3/Boot2Qt/raspberrypi3/toolchain/sysroots/x86_64-pokysdk-linux/usr/bin/python3.5 -m pip install virtualenv 
/home/gleugner/qt/commercial/5.11.3/Boot2Qt/raspberrypi3/toolchain/sysroots/x86_64-pokysdk-linux/usr/bin/python3.5: No module named pip