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Editorial Team
Asked: May 14, 20262026-05-14T06:53:25+00:00 2026-05-14T06:53:25+00:00

I have a C program which has a function call that is defined in

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I have a C program which has a function call that is defined in windows.h (which I have included), however, when I try and compile it with gcc, I get the error:

warning: implicit declaration of function `LockWorkStation'

I looked at the MSDN documentation and I see that this function is the User32 library file, and I was wondering how I would go about linking that to my file.

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  1. Editorial Team
    Editorial Team
    2026-05-14T06:53:25+00:00Added an answer on May 14, 2026 at 6:53 am

    LockWorkstation is available on Windows 2000 and up. You have to declare the version of Windows you are targeting. Make it look like this:

    #define _WIN32_WINNT 0x500
    #include <windows.h>
    
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