Cannot build UDF (getting error)

- June 20, 2022 at 8:45 am
  
  patrick-clark
  Subscriber
  
  I am trying to load a UDF into Fluent but I am getting this error
  
  C:\PROGRA~1\ANSYSI~1\ANSYSS~1\v221\fluent\fluent22.1.0\src\main\global.h(9): fatal error C1083: Cannot open include file: 'stdio.h': No such file or directory
  NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.32.31326\bin\Hostx64\x64\cl.EXE"' : return code '0x2'
  
  I have installed Visual Studio 22 and my Windows OS version is Windows 11. I've downloaded the Windows 11 SDK and I added the location of nmake.exe to my PATH as is the advice I have found online already. I've uninstalled VS 22 several times now as well.
- June 20, 2022 at 9:43 am
  
  Rob
  Ansys Employee
  
  I suspect it's the compiler being newer than Fluent recognises, I think we support VS 2017. Strictly we don't support Win11, but I'm not aware of any issues. What happens if you use the build in CLANG compiler?
  - June 20, 2022 at 10:18 am
    
    patrick-clark
    Subscriber
    
    How do you use the built in CLANG compiler?
    
    It could quite possibly be the version of VS that I installed so I will try changing versions. So there should be no problem that my Windows is updated to windows 11? I assume that I should also download the windows 10 SDK instead also?
    
    I have many questions, so thank you for answering.
- June 20, 2022 at 1:48 pm
  
  Rob
  Ansys Employee
  
  When you compile the UDF there's a tick box "use included compiler". Tick it.
- June 21, 2022 at 9:26 am
  
  DrAmine
  Ansys Employee
  
  Update to the recent version and use the built-in compiler. No need to struggle with VS anymore.

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