[BUG] make command fails

[defg43]

both the manual install and the installer fail after the make command. The error appears to be caused by missing macros in helloshaders.moc.
Output:

$ make
[  3%] Automatic MOC for target kwin4_effect_helloshaders
AutoMoc warning
---------------
"SRC:/kwin-effects/helloshaders.cpp"
includes the moc file "helloshaders.moc", but does not contain a Q_OBJECT, Q_GADGET, Q_NAMESPACE, Q_NAMESPACE_EXPORT, K_PLUGIN_FACTORY, K_PLUGIN_CLASS, K_PLUGIN_FACTORY_WITH_JSON or K_PLUGIN_CLASS_WITH_JSON macro.


AutoMoc subprocess error
------------------------
The moc process failed to compile
  "SRC:/kwin-effects/helloshaders.cpp"
into
  "SRC:/build/kwin-effects/kwin4_effect_helloshaders_autogen/include/helloshaders.moc"
included by
  "SRC:/kwin-effects/helloshaders.cpp"

Command
-------
/usr/bin/moc -DKCOREADDONS_LIB -DKGUIADDONS_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_WIDGETS_LIB -DQT_X11EXTRAS_LIB -DQT_XML_LIB -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -Dkwin4_effect_helloshaders_EXPORTS -I/home/baseduser/ricetemp/hello/hello/build/kwin-effects -I/home/baseduser/ricetemp/hello/hello/kwin-effects -I/usr/include/qt/QtNetwork -I/usr/include/qt/QtOpenGL -I/usr/include/qt -I/usr/include/qt/QtWidgets -I/usr/include/qt/QtGui -I/usr/include/qt/QtCore -I/usr/lib/qt/mkspecs/linux-g++ -I/usr/include/qt/QtX11Extras -I/usr/include/qt/QtXml -I/usr/include/KF5/KConfig -I/usr/include/KF5/KConfigCore -I/usr/include/KF5 -I/usr/include/KF5/KCoreAddons -I/usr/include/KF5/KConfigWidgets -I/usr/include/KF5/KCodecs -I/usr/include/KF5/KWidgetsAddons -I/usr/include/KF5/KConfigGui -I/usr/include/KF5/KAuthWidgets -I/usr/include/KF5/KAuthCore -I/usr/include/KF5/KAuth -I/usr/include/KF5/KGuiAddons -I/usr/include/KF5/KWindowSystem -I/usr/include -I/usr/include/c++/11.2.0 -I/usr/include/c++/11.2.0/x86_64-pc-linux-gnu -I/usr/include/c++/11.2.0/backward -I/usr/lib/gcc/x86_64-pc-linux-gnu/11.2.0/include -I/usr/local/include -I/usr/lib/gcc/x86_64-pc-linux-gnu/11.2.0/include-fixed --include /home/baseduser/ricetemp/hello/hello/build/kwin-effects/kwin4_effect_helloshaders_autogen/moc_predefs.h --output-dep-file -o /home/baseduser/ricetemp/hello/hello/build/kwin-effects/kwin4_effect_helloshaders_autogen/include/helloshaders.moc /home/baseduser/ricetemp/hello/hello/kwin-effects/helloshaders.cpp

Output
------
/home/baseduser/ricetemp/hello/hello/kwin-effects/helloshaders.cpp:30: Parse error at "FILE"

make[2]: *** [kwin-effects/CMakeFiles/kwin4_effect_helloshaders_autogen.dir/build.make:71: kwin-effects/CMakeFiles/kwin4_effect_helloshaders_autogen] Error 1
make[1]: *** [CMakeFiles/Makefile2:809: kwin-effects/CMakeFiles/kwin4_effect_helloshaders_autogen.dir/all] Error 2
make: *** [Makefile:136: all] Error 2

I use Arch with Plasma 5.24.4 and kwin btw