C Struct with cufftHandle

Can anyone tell me how to place a cufftHandle variable inside a C struct such that it can be validly accessed from different C files?
That is, declare a struct in a single header file, define it in another C file, and access struct (and associated cufftHandle) from any other number of C source files.

Thanks

https://devtalk.nvidia.com/default/topic/1055657/gpu-accelerated-libraries/cufft-handle-in-c-struct/post/5351819/#5351819