Unreal Engine 4.16 Preview

Unfortunately I get these:

2>[1/3] Link UE4Editor-D3D11RHI.dll
2>[2/3] Link UE4Editor-SteamVR.dll
2>[3/3] Link UE4Editor-SteamVRController.dll
2>LINK : fatal error LNK1181: cannot open input file ‘openvr_api.lib’
2>LINK : fatal error LNK1181: cannot open input file ‘openvr_api.lib’
2>LINK : fatal error LNK1181: cannot open input file ‘GFSDK_Aftermath_Lib.lib’

I already deleted my Intermediate folder, no dice.

Anyone got any ideas?