当在wsl上使用沙丘时，ctype是隐藏的(未满足'exist_if')错误

Question

我在我的windows10机器上使用wsl ubuntu，并试图使用dune构建一个ocaml项目(https://github.com/adamrk/llvm-ocaml-tutorial)。不幸的是，我得到了这个错误：

# dune build bin/kaleidoscope.exe
File "/home/impor/.opam/4.10.0/lib/ctypes/META", line 1, characters 0-0:
Error: Library "ctypes.foreign.threaded" in
/home/impor/.opam/4.10.0/lib/ctypes is hidden (unsatisfied 'exist_if').
-> required by library "ctypes.foreign" in
   /home/impor/.opam/4.10.0/lib/ctypes
-> required by executable kaleidoscope in bin/dune:2
Hint: try: dune external-lib-deps --missing bin/kaleidoscope.exe

我找不到任何关于这方面的文档，所以我非常迷茫。

# dune external-lib-deps --missing bin/kaleidoscope.exe

什么也不做

Answer 1

这是因为没有安装opam包ctypes-foreign。