[Lazarus] Linux make libQt5Pas fails

[Anthony Walter]

On Linux when following the instructions in the
in lcl/interfaces/qt5/cbindings/README.TXT, I get this error during the
make stage:

g++ -c -m64 -pipe -Wfatal-errors -g -w -D_REENTRANT -fPIC -DBINUX
-DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_X11EXTRAS_LIB -DQT_GUI_LIB
-DQT_NETWORK_LIB -DQT_CORE_LIB -I. -isystem
/usr/include/x86_64-linux-gnu/qt5 -isystem
/usr/include/x86_64-linux-gnu/qt5/QtPrintSupport -isystem
/usr/include/x86_64-linux-gnu/qt5/QtWidgets -isystem
/usr/include/x86_64-linux-gnu/qt5/QtX11Extras -isystem
/usr/include/x86_64-linux-gnu/qt5/QtGui -isystem
/usr/include/x86_64-linux-gnu/qt5/QtNetwork -isystem
/usr/include/x86_64-linux-gnu/qt5/QtCore -Itmp
-I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 -o tmp/qwindow_c.o
src/qwindow_c.cpp
In file included from src/qwindow_c.cpp:12:0:
src/qwindow_c.h:54:113: error: ‘QWindow::AncestorMode’ is not a class or
namespace
 handle, const QWindowH child, QWindow::AncestorMode mode =
QWindow::AncestorMod
                                                                     ^
compilation terminated due to -Wfatal-errors.
Makefile:2587: recipe for target 'tmp/qwindow_c.o' failed
make: *** [tmp/qwindow_c.o] Error 1

Building on Ubuntu 16.04. Any suggestions?
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