Missing ws2def.h, from which package can I download?

I'm trying to compile a C++ project on Win10 Pro with Eclipse, MinGW and the POCO library. A POCO header include ws2def.h that is missing on my Laptop. From which package/library/website can I find this missing file ? MinGW seems not to install it...

Solution

That is not a POCO header. It is a Win32 API header. MinGW seems to have its own version of it.

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