wasm3-rs: Can't compile with build-bindgen

I can’t get to compile to crate in any way. I’ve installed clang from brew and also MacOS Xcode devtools, but if I use the build-bindgen features I get the following error:

Caused by:
  process didn't exit successfully: `/Users/jiayihu/Desktop/Repo/fedra-thesis/fedra/target/debug/build/wasm3-sys-c75d8740be89c22d/build-script-build` (exit code: 101)
  --- stderr
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/cdefs.h:807:2: error: Unsupported architecture
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/_types.h:34:2: error: architecture not supported
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:55:9: error: unknown type name '__int64_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:56:9: error: unknown type name '__int32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:57:9: error: unknown type name '__int32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:60:9: error: unknown type name '__uint32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:61:9: error: unknown type name '__uint32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:62:9: error: unknown type name '__uint64_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:68:9: error: unknown type name '__darwin_natural_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:70:9: error: unknown type name '__uint16_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:71:9: error: unknown type name '__int64_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:72:9: error: unknown type name '__int32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:73:9: error: unknown type name '__uint32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:74:9: error: unknown type name '__int32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:75:9: error: unknown type name '__uint32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:76:9: error: unknown type name '__uint32_t'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/types.h:37:2: error: architecture not supported
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types/_va_list.h:32:9: error: unknown type name '__darwin_va_list'
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types/_size_t.h:31:9: error: unknown type name '__darwin_size_t'
  fatal error: too many errors emitted, stopping now [-ferror-limit=]
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/cdefs.h:807:2: error: Unsupported architecture, err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/_types.h:34:2: error: architecture not supported, err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:55:9: error: unknown type name '__int64_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:56:9: error: unknown type name '__int32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:57:9: error: unknown type name '__int32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:60:9: error: unknown type name '__uint32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:61:9: error: unknown type name '__uint32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:62:9: error: unknown type name '__uint64_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:68:9: error: unknown type name '__darwin_natural_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:70:9: error: unknown type name '__uint16_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:71:9: error: unknown type name '__int64_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:72:9: error: unknown type name '__int32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:73:9: error: unknown type name '__uint32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:74:9: error: unknown type name '__int32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:75:9: error: unknown type name '__uint32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:76:9: error: unknown type name '__uint32_t', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/types.h:37:2: error: architecture not supported, err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types/_va_list.h:32:9: error: unknown type name '__darwin_va_list', err: true
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types/_size_t.h:31:9: error: unknown type name '__darwin_size_t', err: true
  fatal error: too many errors emitted, stopping now [-ferror-limit=], err: true
  thread 'main' panicked at 'Failed to generate bindings: ()', /Users/jiayihu/.cargo/registry/src/github.com-1ecc6299db9ec823/wasm3-sys-0.1.2/build.rs:121:10
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Trying instead to compile it without the bindgen feature results in the following error:

error: failed to run custom build command for `wasm3-sys v0.1.2`

Caused by:
  process didn't exit successfully: `/Users/jiayihu/Desktop/Repo/fedra-thesis/fedra/target/debug/build/wasm3-sys-ed19931fe417e3c8/build-script-build` (exit code: 101)
  --- stderr
  wasm3/source/m3_core.h:11:10: fatal error: 'stdio.h' file not found
  wasm3/source/m3_core.h:11:10: fatal error: 'stdio.h' file not found, err: true
  thread 'main' panicked at 'Unable to generate bindings: ()', /Users/jiayihu/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.55.1/src/main.rs:54:36
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
  thread 'main' panicked at 'Failed to run bindgen: ExitStatus(ExitStatus(256))', /Users/jiayihu/.cargo/registry/src/github.com-1ecc6299db9ec823/wasm3-sys-0.1.2/build.rs:80:9
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I’ve also tried to just run clang -v a.c where a.c contains only an include of stdio.h and it works without issue, meaning it’s able to find the header file. So the issue is in rust bindgen or something in this crate I suppose.