C2065: 'D3D11_BUFFER_UAV_FLAG_COUNTER' : undeclared identifier (compile issue)

[AdderDee]

So I'm getting a little closer to having PCSX2 compile properly, but I'm getting this error:

Code:

error C2065: 'D3D11_BUFFER_UAV_FLAG_COUNTER' : undeclared identifier     GSRendererCS.cpp

I Googled this error but didn't find anything relating to PCSX2. Any help is greatly appreciated.