Determining if the include file pthread.h exists failed with the following output:
Change Dir: D:/Code/Projects/kde/out/build/x64-Debug/CMakeFiles/CMakeTmp

Run Build Command(s):C:/Program Files/Microsoft Visual Studio/2022/Community/Common7/IDE/CommonExtensions/Microsoft/CMake/Ninja/ninja.exe cmTC_210ee && [1/2] Building C object CMakeFiles\cmTC_210ee.dir\CheckIncludeFile.c.obj

FAILED: CMakeFiles/cmTC_210ee.dir/CheckIncludeFile.c.obj 

C:\PROGRA~1\MIB055~1\2022\COMMUN~1\VC\Tools\MSVC\1432~1.313\bin\Hostx64\x64\cl.exe  /nologo   /DWIN32 /D_WINDOWS  /Zi /Ob0 /Od /RTC1 -MDd /showIncludes /FoCMakeFiles\cmTC_210ee.dir\CheckIncludeFile.c.obj /FdCMakeFiles\cmTC_210ee.dir\ /FS -c D:\Code\Projects\kde\out\build\x64-Debug\CMakeFiles\CMakeTmp\CheckIncludeFile.c

D:\Code\Projects\kde\out\build\x64-Debug\CMakeFiles\CMakeTmp\CheckIncludeFile.c(1): fatal error C1083: Cannot open include file: 'pthread.h': No such file or directory
ninja: build stopped: subcommand failed.