Example waterpump/simulationserver not compiling

g++ -c -pipe -O2 -std=gnu++11 -Wall -Wextra -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_OPCUA_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -I/home/johanna/RTA/qt5/Examples/Qt-5.15.2/opcua/waterpump/simulationserver/../../../..//src/plugins/opcua/open62541 -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtOpcUa/5.15.2 -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtOpcUa/5.15.2/QtOpcUa -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtOpcUa -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtNetwork/5.15.2 -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtNetwork/5.15.2/QtNetwork -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtNetwork -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtCore/5.15.2 -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtCore/5.15.2/QtCore -I/home/johanna/RTA/qt5/5.15.2/gcc_64/include/QtCore -I. -I/home/johanna/RTA/qt5/5.15.2/gcc_64/mkspecs/linux-g++ -o main.o main.cpp
In file included from main.cpp:51:
simulationserver.h:54:10: fatal error: qopen62541.h: No such file or directory
   54 | #include <qopen62541.h>
      |          ^~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:851: main.o] Error 1