the detailed operation

[shaochaoxiong]

Hello, I want to implement some samples in the Samples folder,however,when I make, there are a lot of messages like "undefined reference to "caml_...".
The error message is like “File "caml_startup", line 1:
Error: Error during linking (exit code 1)
ocamlopt SpocLibs/Samples/Bitonic_sort/Bitonic_sort.exe (exit 2)”.
Then a "_build" folder is generated，however, there are no executable files in the Samples folder.
Can you tell me the detailed steps？
My configuration is as follows：
$ ocaml
OCaml version 4.12.0
$ nvcc -V
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2020 NVIDIA Corporation
Built on Wed_Jul_22_19:09:09_PDT_2020
Cuda compilation tools, release 11.0, V11.0.221
Build cuda_11.0_bu.TC445_37.28845127_0

and the version of spoc is 20210823.
In addition, I did it under WSL.