Read this.
http://doc.qt.io/qt-5/platform-notes-qnx.html
About Qt 5's lack of support for BlackBerry 10, you are right and wrong at the same time. BlackBerry 10 supported the bundling of Qt 5 in a .BAR file, and that "BB10 support" was discontinued with Qt 5.5. Call us when Qt for QNX Neutrino is deprecated.
Wide vision, from Chile.