$ ebuild build   # fix/toolchain-error-message 47881a3; arm-none-eabi-gcc not on PATH; stdout and stderr in one stream (2>&1)

=== ebuild — Build ===
   Loading configuration...
[info] Project: demo v0.1.0
[info] Auto-detected backend: ninja
   Resolving dependency graph...
   Resolving toolchain...
[error] Toolchain error: toolchain target 'arm-none-eabi' resolves to 'arm-none-eabi-gcc', which was not found on PATH. Install the toolchain or fix 'toolchain.target'.
[exit code 1]