undefined reference to `WinMain'

FAILED: examples/interfaceframework/qface-tutorial/ch5-ipc/chapter5-ipc-server.exe 
cmd.exe /C "cd . && C:\MINGW_PATH\mingw64\bin\g++.exe -g -DNDEBUG -O2  examples/interfaceframework/qface-tutorial/ch5-ipc/simulation_server/CMakeFiles/chapter5-ipc-server.dir/chapter5-ipc-server_autogen/mocs_compilation.cpp.obj -o examples\interfaceframework\qface-tutorial\ch5-ipc\chapter5-ipc-server.exe -Wl,--out-implib,examples\interfaceframework\qface-tutorial\ch5-ipc\simulation_server\libchapter5-ipc-server.dll.a -Wl,--major-image-version,0,--minor-image-version,0  C:/Users/qt/work/install/lib/libQt6Core.a  -lmpr  -luserenv  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
C:/MINGW_PATH/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/MINGW_PATH/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crtexewin.o):crtexewin.c:(.text.startup+0xbd): undefined reference to `WinMain'
collect2.exe: error: ld returned 1 exit status