javascriptcore.pri file is missing

[billthebiker]

I have been trying to setup Qt Creator so I can create a custom plugin; the steps so far:

$ git clone http://code.qt.io/qt-creator/qt-creator.git
$ cd qt-creator
$ git checkout -b 4.11 v4.11.0
$ git submodule init
$ git submodule update --recursive
when I try to build the qtcreator.pro project this error message pops up:

Cannot read /home/bill/qt-creator/src/shared/qbs/src/shared/qtscript/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri:-1: error: No such file or directory

searched on Google but there is no mention of this problem. Obviously I need to install the javascriptcore.pri but I have no idea