Efawin headers and loader can be obtained from https://github.com/aws/efawin.

Copy the contents of the folder including subfolders from 
https://github.com/aws/efawin/tree/v1.0.0/interface
into the folder containing this file.

Note that Efawin.dll and its dependencies are needed at runtime
for libfabric's EFA provider to successfully use it.
Please use https://github.com/aws/efawin/blob/v1.0.0/README.md to prepare
the necessary dependencies.
