87 | extern crate proc_macro;
|    | ^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
|
| error: aborting due to previous error
|
| For more information about this error, try `rustc --explain E0463`.
| error: could not compile `proc-macro2`
|
| Caused by:
|   process didn't exit successfully: `rustc --crate-name proc_macro2 --edition=2018 /home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0/rustc-1.51.0-src/vendor/proc-macro2-1.0.19/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no --cfg 'feature="default"' --cfg 'feature="proc-macro"' -C metadata=cb5ee8106fa0df70 -C extra-filename=-cb5ee8106fa0df70 --out-dir /home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0/build/target/aarch64-eg-linux/release/deps --target aarch64-eg-linux -C linker=/home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0/wrapper/target-rust-ccld -L dependency=/home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0/build/target/aarch64-eg-linux/release/deps -L dependency=/home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0/build/target/release/deps --extern unicode_xid=/home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0/build/target/aarch64-eg-linux/release/deps/libunicode_xid-1a6ef0c4b108f696.rmeta --cap-lints allow -L /home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0/recipe-sysroot/usr/lib/rust --remap-path-prefix=/home/willie/kontron/imx8mm/yocto-ktn/build-ktn-imx/tmp/work/aarch64-eg-linux/cargo/1.51.0-r0=/usr/src/debug/cargo/1.51.0-r0 --cfg hygiene --cfg use_proc_macro --cfg wrap_proc_macro` (exit code: 1)
| WARNING: exit code 101 from a shell command.