Tensorboard data server fails to build through rust due to rust cargo not building on pcc64le

I am attempting to set tensorboard to run on ppc64le, built through the Spack package manager. Spack handles all environment and build issues. Spack first builds the package py-tensorboard-data-server, which is from /tensorboard/data/server, and then builds the rest of py-tensorboard. To build py-tensorboard-data-server it uses the cargo system, and essentially just does cargo build --release in the directory. The code fails due to the rust cargo, ring, failing to build. From what I can gather here, ringv0.16.20 can not be built on ppc64le, but the newer versions can be. I was hoping to see if someone can update the dependencies on tensorboard/data/server so that they use 0.17.0+ so that tensorboard can be built on ppc.. I have attempted to do this on my own a number of ways, from manually editing the cargo.toml, to trying to use cargo-raze, but I have had no luck with cargo-raze.

Environment information (required)

Attached is the environment file that was generated by spack.
spack-build-env.txt

Steps to reproduce (required)

After spack generates the environement, it runs cargo build --release in the //tensorboard/data/server .
The error I get is

...
   Compiling ring v0.16.20
   Compiling tracing-futures v0.2.5
   Compiling tokio v1.19.2
   Compiling futures-util v0.3.8
   Compiling rand v0.7.3
   Compiling prost-types v0.9.0
   Compiling serde_json v1.0.61
   Compiling serde_urlencoded v0.7.0
   Compiling time v0.3.14
error: failed to run custom build command for `ring v0.16.20`

Caused by:
  process didn't exit successfully: `/tmp/dax/spack-stage/spack-stage-py-tensorboard-data-server-0.8.0-cub5uadxzbvogsbw57gmnn7biqw4py3p/spack-src/tensorboard/data/server/target/release/build/ring-aa93677e37a58da5/build-script-build` (exit status: 101)
  --- stderr
  thread 'main' panicked at /tmp/dax/spack-stage/spack-stage-py-tensorboard-data-server-0.8.0-cub5uadxzbvogsbw57gmnn7biqw4py3p/spack-src/registry/src/index.crates.io-6f17d22bba15001f/ring-0.16.20/build.rs:358:10:
  called `Option::unwrap()` on a `None` value
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
...

Start in tensorboard/data/server, inspect the Cargo dependency declarations, and reproduce the failure with cargo build --release in the Spack-generated environment. Check how ring is selected and update the relevant dependency to a supported 0.17.0-or-newer release; done means the ppc64le build completes without the ring 0.16.20 failure.