failed to run custom build command for `curl-sys v0.4.36+curl-7.71.1`

When trying to cargo install a package that depends on this package, I am getting this error.

I found an issue that was very similar, if not the same as mine:
https://github.com/alexcrichton/curl-rust/issues/240

I looked at the solution, where someone added a conditional on the custom build script based off of the xcodebuild -version being greater than or less than 9.

I am on xcodebuild -version = 12.3
I am running a mac OS and just upgraded to bigsur

```
warning: clang-4.0: warning: argument unused during compilation: '-L/usr/local/lib' [-Wunused-command-line-argument]
warning: clang-4.0: warning: argument unused during compilation: '-L/usr/local/lib' [-Wunused-command-line-argument]
warning: clang-4.0: warning: argument unused during compilation: '-L/usr/local/lib' [-Wunused-command-line-argument]
warning: clang-4.0: warning: argument unused during compilation: '-L/usr/local/lib' [-Wunused-command-line-argument]
warning: curl/lib/connect.c:1219:30: error: unrecognized platform name macOS
warning: if(__builtin_available(macOS 10.11, iOS 9.0, tvOS 9.0, watchOS 2.0, *)) {
warning: ^
warning: curl/lib/connect.c:1219:43: error: unrecognized platform name iOS
warning: if(__builtin_available(macOS 10.11, iOS 9.0, tvOS 9.0, watchOS 2.0, *)) {
warning: ^
warning: curl/lib/connect.c:1219:52: error: unrecognized platform name tvOS
warning: if(__builtin_available(macOS 10.11, iOS 9.0, tvOS 9.0, watchOS 2.0, *)) {
warning: ^
warning: curl/lib/connect.c:1219:62: error: unrecognized platform name watchOS
warning: if(__builtin_available(macOS 10.11, iOS 9.0, tvOS 9.0, watchOS 2.0, *)) {
warning: ^
warning: 4 errors generated.

error: failed to run custom build command for `curl-sys v0.4.36+curl-7.71.1`
```

At this point I am not sure if it is something I have configured incorrectly, or an actual issue with the code/project. Because I saw someone with a similar issue, I thought I would repost and try to find out more. Any guidance is much appreciated.

Best Wishes!