error: C1083: Cannot open include file: 'pthread.h': No such file or directory

I am trying to build a project using Qt creator tool in windows but when I built it , I got this error: error: C1083: Cannot open include file: 'pthread.h': No such file or directory.

So do I have to download this library? but i did not find it

I am using Qt in order to open a tool called netanim used for NS3 tool


Thanks in advance
so I just need to download it ? is there any extra requirements ??
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