Error when running make to build safetrace/enclave

[sbellem]

When following the instructions under https://github.com/enigmampc/SafeTrace/tree/master/enclave#installation, I get the following error for step 4 (running make):

   Compiling remove_dir_all v0.5.3
     Running `rustc --crate-name remove_dir_all /home/sylvain/.cargo/registry/src/github.com-1ecc6299db9ec823/remove_dir_all-0.5.3/src/lib.rs --color always --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C metadata=be87529a05a53033 -C extra-filename=-be87529a05a53033 --out-dir /home/sylvain/code/enigmampc/SafeTrace/enclave/safetrace/enclave/target/release/deps -L dependency=/home/sylvain/code/enigmampc/SafeTrace/enclave/safetrace/enclave/target/release/deps --cap-lints allow`
error[E0658]: `cfg(doctest)` is experimental and subject to change
  --> /home/sylvain/.cargo/registry/src/github.com-1ecc6299db9ec823/remove_dir_all-0.5.3/src/lib.rs:12:7
   |
12 | #[cfg(doctest)]
   |       ^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/62210
   = help: add `#![feature(cfg_doctest)]` to the crate attributes to enable

error[E0658]: `cfg(doctest)` is experimental and subject to change
  --> /home/sylvain/.cargo/registry/src/github.com-1ecc6299db9ec823/remove_dir_all-0.5.3/src/lib.rs:16:7
   |
16 | #[cfg(doctest)]
   |       ^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/62210
   = help: add `#![feature(cfg_doctest)]` to the crate attributes to enable

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.
error: Could not compile `remove_dir_all`.

Caused by:
  process didn't exit successfully: `rustc --crate-name remove_dir_all /home/sylvain/.cargo/registry/src/github.com-1ecc6299db9ec823/remove_dir_all-0.5.3/src/lib.rs --color always --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C metadata=be87529a05a53033 -C extra-filename=-be87529a05a53033 --out-dir /home/sylvain/code/enigmampc/SafeTrace/enclave/safetrace/enclave/target/release/deps -L dependency=/home/sylvain/code/enigmampc/SafeTrace/enclave/safetrace/enclave/target/release/deps --cap-lints allow` (exit code: 1)
warning: build failed, waiting for other jobs to finish...
error: build failed
Makefile:33: recipe for target 'bindgen' failed
make[1]: *** [bindgen] Error 101
make[1]: Leaving directory '/home/sylvain/code/enigmampc/SafeTrace/enclave/safetrace/enclave'
Makefile:179: recipe for target 'enclave' failed
make: *** [enclave] Error 2

I've tried using a different nightly build, but then ran into other issues. So for now, in order to proceed forward, I followed the help message in the above error:

help: add `#![feature(cfg_doctest)]` to the crate attributes to enable

which means that I added the line #![feature(cfg_doctest)] at the top of the root crate of remove_dir_all. I doubt quite strongly that this is "the" fix, and wonder if someone has a better suggestion.

I doubt it is relevant, but just in case that helps, here's the output I get from sgx-detect: