Cargo build log for Yew app

cargo.build.log

[robert.butler@mc01 multi_thread]$ cargo build --target wasm32-unknown-unknown
   Compiling cfg-if v0.1.10
   Compiling futures-core v0.3.5
   Compiling once_cell v1.4.0
   Compiling futures-sink v0.3.5
   Compiling pin-utils v0.1.0
   Compiling futures-io v0.3.5
   Compiling slab v0.4.2
   Compiling itoa v0.4.5
error[E0463]: can't find crate for `core`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error[E0463]: can't find crate for `core`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: could not compile `pin-utils`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: could not compile `cfg-if`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: could not compile `futures-io`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: could not compile `once_cell`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

For more information about this error, try `rustc --explain E0463`.
error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: could not compile `futures-core`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: could not compile `itoa`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: could not compile `futures-sink`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: could not compile `slab`.

To learn more, run the command again with --verbose.